Originally published in August 2019 and comprehensively updated/edited in June 2026.
In 2019, research in psychology, neuroscience, and sociology confirmed what millions already felt: humans were emotionally exhausted long before the crises of the 2020s arrived.
There was a particular feeling in the air in the late 2010s that was hard to name but impossible to ignore. It wasn’t quite despair, and it wasn’t quite anger — though both were present in abundance. It was closer to a bone-deep fatigue. A sense that the world was producing more stimulation, more outrage, more obligation, and more noise than any human nervous system was really designed to process. People were exhausted. Not just from work or family or the usual pressures of adult life, but from the relentless psychic weight of being alive and connected in the modern world.
In the summer of 2019, that exhaustion was quietly becoming a subject of serious research and public conversation. Anne Helen Petersen had just published her widely shared BuzzFeed essay on millennial burnout. The World Health Organization had officially classified burnout as an occupational phenomenon in its International Classification of Diseases. Researchers in neuroscience and behavioral economics were publishing findings that described, in clinical terms, what millions of ordinary people were experiencing in ways they struggled to articulate. The data was beginning to confirm what many had already felt in their bodies: the modern world was extracting something from people, and many were running low.
What followed — the pandemic, the social upheavals of 2020, the inflationary shocks, and the accelerating displacement caused by artificial intelligence — would confirm that 2019 was not a peak of stress but a kind of baseline. A floor. Understanding what was already happening to human psychology and society in that period matters because it explains much of what came afterward. The conditions were already set. The kindling was already dry.
The Architecture of Overwhelm
More Information Than the Brain Was Built For
To understand why humans were already emotionally exhausted by 2019, it helps to start with the human brain itself — not as a metaphor, but as a physical system with real constraints.
The prefrontal cortex, the region of the brain most associated with decision-making, planning, and emotional regulation, operates like a muscle. It fatigues. Research by Roy Baumeister and colleagues in the late 1990s and 2000s introduced the concept of “ego depletion” — the idea that self-control and deliberate decision-making draw from a limited cognitive resource that diminishes with use. Although subsequent research raised questions about the specific mechanism, the broader observation held up: sustained cognitive and emotional effort has real costs, and those costs accumulate over the course of a day, a week, a life.
By 2019, the average adult in a developed country was making somewhere between 20,000 and 35,000 decisions per day, according to estimates cited by researchers studying decision fatigue. The exact number is difficult to pin down — most of these decisions are trivial — but the aggregate effect is not. What psychologists Barry Schwartz described in his 2004 book “The Paradox of Choice” had, by 2019, been turbocharged by smartphones, streaming services, social media platforms, and e-commerce. Every scroll through a feed was a series of micro-decisions: engage, dismiss, share, ignore, react. Every app was another claim on attention. The cognitive overhead of modern life had expanded enormously, and the brain was paying the price.
This was happening against a backdrop of genuine information overload. By 2019, the average smartphone user received somewhere between 65 and 80 push notifications per day — each one a small interruption, a small demand for assessment and response. Humans evolved in environments where socially relevant information arrived intermittently rather than continuously. By 2019, the pace was relentless and the emotional valence of much of that information was negative. News algorithms had long since learned that outrage and anxiety kept users engaged. Fear drove clicks. Conflict extended sessions. The business model of the attention economy, as researcher Tim Wu and others documented in detail, was built on exploiting the brain’s evolved sensitivity to threat and novelty.
When Stress Becomes Chronic
Acute stress, the kind that evolved to help humans survive immediate physical dangers, is actually quite manageable for the body. The stress response — the release of cortisol and adrenaline, the sharpening of attention, the mobilization of energy — is designed to be short-lived. The gazelle runs from the lion; either it escapes or it doesn’t. Either way, the episode ends.
Chronic stress is something else entirely. When the stress response is activated repeatedly over long periods, without adequate recovery, the physiological consequences are significant. Prolonged exposure to elevated cortisol has been linked to impaired memory and concentration, disruption of sleep architecture, weakened immune function, and increased risk of anxiety and depression. Researchers at Carnegie Mellon University, in studies led by Sheldon Cohen, demonstrated that chronic stress measurably increases susceptibility to illness, not just as a vague metaphor but as a documented biological reality.
By 2019, the sources of chronic stress in modern life were well documented: financial precarity, housing insecurity, long working hours, the blurring of work and home life enabled by smartphones, political polarization, social comparison amplified by social media, and the persistent low-grade dread that comes from consuming a news cycle that seemed to produce a new crisis every forty-eight hours. These were not imaginary stressors. For many people — particularly those living paycheck to paycheck, managing health conditions without adequate care, or navigating the specific anxieties of parenthood in an uncertain world — the stress was entirely rational. The exhaustion was earned.
The Burnout Epidemic
What Burnout Actually Is
Burnout is often discussed as though it were simply a synonym for being tired. It isn’t. The psychologist Christina Maslach, who has spent decades studying the phenomenon, defines burnout along three dimensions: emotional exhaustion, depersonalization (a growing cynicism and detachment from one’s work and the people associated with it), and a diminished sense of personal accomplishment. The World Health Organization’s 2019 classification described it specifically as a syndrome resulting from “chronic workplace stress that has not been successfully managed.”
What made the 2019 moment significant was not the discovery of burnout — Maslach had been writing about it since the 1970s — but the widening of the population it was visibly affecting. Burnout had historically been associated with helping professions: doctors, nurses, social workers, teachers. By 2019, it had spread into knowledge work, creative industries, and the service sector. The mechanisms driving it had also shifted. It was no longer just about compassion fatigue or the specific demands of emotionally intensive jobs. It was also about structural conditions: the expectation of constant availability, the elimination of boundaries between professional and personal time, the gamification of productivity, and the increasing pressure to perform not just competently but with visible enthusiasm.
Petersen’s essay, which went viral in January 2019, resonated so deeply partly because she put a coherent framework around something that millions of millennials had been experiencing without being able to name it. She argued that millennial burnout was not just about working too hard; it was about a generation that had been optimized since childhood to treat every activity as a potential credential, every relationship as a potential networking opportunity, every moment of rest as a potential competitive disadvantage. The result was people who were not simply tired from effort but who had lost the ability to feel genuinely restored by rest — because even rest had become another task to perform correctly.
The Body Keeps the Score
Bessel van der Kolk’s 2014 book “The Body Keeps the Score” brought a crucial insight to a popular audience: psychological distress is not only experienced mentally but stored physically, in measurable changes to the nervous system. The underlying science had been building for decades. Researchers studying adverse childhood experiences (ACEs) had demonstrated, in a landmark 1998 study by Felitti and Anda, that early trauma had long-term consequences for physical health — including increased risk of heart disease, diabetes, and depression — that persisted independent of adult lifestyle choices.
By 2019, this research had expanded into a broader concept: allostatic load, the cumulative wear and tear on the body produced by chronic stress over time. Researchers like Bruce McEwen at Rockefeller University documented how sustained activation of the stress response gradually erodes the body’s regulatory systems — lowering the threshold for anxiety, increasing inflammation, and diminishing the capacity for pleasure. This was the science underlying what many people were describing as feeling depleted. Not lazy. Not weak. Depleted in a way that was physiological as much as psychological.
The Sleep Debt Society
Sleep is not a passive state. It is the brain’s primary recovery mechanism — the period during which memories consolidate, stress hormones reset, emotional experiences are processed, and the glymphatic system clears metabolic waste from neural tissue. Matthew Walker, a neuroscientist at UC Berkeley whose 2017 book “Why We Sleep” reached a popular audience just before the period in question, described sleep deprivation as one of the most broadly damaging things a person can do to their brain and body, affecting everything from immune function to emotional regulation to cardiovascular health.
By 2019, a significant portion of the American population was chronically underslept. The Centers for Disease Control had declared insufficient sleep a public health epidemic: roughly a third of adults were regularly getting less than the recommended seven hours per night. Shift workers, new parents, people working multiple jobs, and anyone managing significant financial stress — groups that overlapped substantially — were among the most affected.
The smartphone had become a direct saboteur of sleep architecture in ways that were only becoming clear to researchers. Blue light emitted by screens suppresses melatonin production, delaying the onset of sleep even when users put their devices down. But the physiological mechanism was arguably less damaging than the behavioral one. Many people were simply staying awake longer because their phone was there — scrolling through feeds at midnight not because they wanted to but because the design of the platforms made stopping genuinely difficult. Variable reward schedules, the same psychological mechanism that makes slot machines compelling, were baked into the infinite scroll. One more post. One more refresh.
The result was a population that was not only running on insufficient sleep but was losing sleep specifically to the same technologies that were simultaneously increasing their cognitive load and social anxiety during waking hours. The system was closed and self-reinforcing: stress made sleep harder; poor sleep amplified stress reactivity; heightened reactivity drove more compulsive phone use; phone use further degraded sleep. Allostatic load accumulated in the dark, in beds lit by small screens.
Technology, Attention, and the Erosion of Rest
The Smartphone as Nervous System Extension
It is difficult to overstate how completely the smartphone had rewired daily life by 2019. According to data from App Annie and similar analytics firms, the average American was spending roughly three to four hours per day on their phone. For younger users, the number was often higher. These were not idle hours — they were hours of fragmented attention, social monitoring, emotional reactivity, and continuous low-level stimulation.
Neuroscientist and psychiatrist Daniel Siegel had written about the importance of what he called “time in” — periods of quiet, inward-directed attention that allow the brain to consolidate experience, regulate emotion, and restore cognitive resources. The default mode network, a set of brain regions that activates during mind-wandering and self-reflection, plays a crucial role in emotional processing and creativity. It requires downtime to do its work effectively.
The smartphone was, among other things, a default mode network interrupter. Every notification was an invitation to redirect attention outward. Every moment of potential boredom — standing in line, riding the subway, sitting in a waiting room — had become an opportunity to consume. Boredom, which researchers like Sandi Mann at the University of Central Lancashire had identified as a psychologically important state that promotes daydreaming, creativity, and emotional processing, was being systematically eliminated from daily life. The consequence was not just distraction. It was a narrowing of the mental space in which recovery, reflection, and meaning-making normally occur.
The research on adolescents was particularly striking. Jean Twenge, a psychologist at San Diego State University, published data in 2017 and 2018 showing that increases in adolescent depression, loneliness, and anxiety tracked closely with the adoption of smartphones and social media, particularly among girls. The relationship was correlational, not conclusively causal, and the research was contested — other researchers argued that the effect sizes were modest and that social media was one factor among many. But the direction of the finding was consistent with what clinicians were observing in practice: something had changed for adolescents around 2012, when smartphone ownership became widespread, and the change was not positive.
Social Comparison in Real Time
Humans are intensely social animals, and social comparison — assessing one’s status, resources, and relationships relative to others — is a normal and evolutionarily ancient cognitive process. In previous eras, most people compared themselves to neighbors, coworkers, and immediate community members. The reference group was local and relatively modest.
Social media had dramatically expanded and distorted the reference group. By 2019, a person of ordinary means could spend an hour scrolling through images of other people’s vacations, homes, relationships, bodies, and career accomplishments — most of them filtered, curated, and strategically presented for maximum appeal. The psychological research on upward social comparison consistently found that it tends to decrease wellbeing, increase envy, and reduce satisfaction with one’s own circumstances. Social psychologist Leon Festinger had laid out the theoretical framework for social comparison in 1954; Instagram had turned it into an ambient condition of daily life.
What was particularly corrosive was the combination of social comparison with the illusion of access. Unlike watching a celebrity on television — which most people processed as a categorically different kind of existence — social media presented aspirational lifestyles as though they were the normal lives of ordinary people whom you personally knew. The gap between one’s own life and the curated projection of someone else’s felt not like the natural distance between different circumstances but like evidence of personal failure.
Economic Anxiety and the Conditions of Precarity
The emotional exhaustion of 2019 was not only a product of technology and psychology. It was also deeply material. In the United States, housing costs in major metropolitan areas had increased far faster than incomes, particularly for younger adults. Healthcare costs had continued their decades-long ascent. Student loan debt had crossed the $1.5 trillion mark. The gig economy — celebrated in some quarters as liberation from traditional employment — had produced a large population of workers without benefits, job security, or predictable incomes who bore the full risk of economic fluctuation personally.
Research by Sendhil Mullainathan and Eldar Shafir, published in their 2013 book “Scarcity,” documented how resource scarcity creates a specific cognitive burden they called the “bandwidth tax.” When people are preoccupied with meeting immediate needs, the mental bandwidth available for planning, self-regulation, and long-term thinking is measurably reduced. The poor, the study found, were not making bad decisions because they lacked intelligence or discipline; they were making decisions under cognitive conditions that reliably produce error. But by 2019, financial anxiety had spread well into the middle class — among people who were employed and nominally stable but who lived with the persistent background awareness that a medical bill, a car repair, or a job loss could destabilize everything. The Federal Reserve consistently found that large proportions of American households lacked sufficient savings to cover even a modest unexpected expense. That kind of ongoing precarity takes a measurable toll on the nervous system.
A related anxiety, quieter in 2019 but already present, concerned the future of work itself. Automation had been restructuring manufacturing employment for decades, but by the late 2010s, researchers and economists were publishing projections suggesting that machine learning and AI systems might increasingly displace knowledge workers — the accountants, paralegals, radiologists, and writers who had previously felt insulated from technological unemployment. A 2017 McKinsey Global Institute report estimated that between 400 million and 800 million jobs globally could be displaced by automation by 2030. Whether or not those projections were accurate, their circulation contributed to a diffuse, hard-to-articulate unease among educated professionals — a background sense that the floor beneath their particular competence might be less stable than they had assumed.
The Loneliness Underneath
Running alongside economic anxiety was something perhaps even more fundamental: loneliness. In 2018, the United Kingdom had appointed a Minister for Loneliness — a headline that prompted both genuine concern and a certain amount of dark humor — after research commissioned by the Jo Cox Foundation found that millions of Britons suffered from chronic loneliness. In the United States, researchers Julianne Holt-Lunstad and colleagues had published meta-analyses finding that social isolation and loneliness were associated with mortality risks comparable to smoking fifteen cigarettes a day.
These were not merely sentimental findings. The human need for social connection is not a preference but a biological necessity. Evolutionary biologist John Cacioppo, who spent decades studying loneliness before his death in 2018, argued that social pain activates the same neural pathways as physical pain. Humans who felt isolated in ancestral environments were genuinely at higher risk of death — from predators, from exposure, from lack of cooperative resources. The distress of loneliness is the body’s alarm system for a condition that, evolutionarily, was often fatal.
In 2019, large numbers of people were living in conditions that, despite the nominal connectivity of social media, produced functional isolation. Rates of civic participation had declined. Religious community — which, whatever its theological content, had historically provided regular face-to-face social gathering, shared ritual, and mutual support — had diminished. Urban design in many parts of the country actively discouraged the kinds of spontaneous, unplanned social interaction that Sociologist Ray Oldenburg had called “third places.” The digital simulation of connection was filling the space left by the attrition of its embodied forms, and the substitution was imperfect.
The Cumulative Picture
A System Running Past Capacity
What emerges from reviewing the research landscape of 2019 is not a story of any single cause but of multiple stressors operating simultaneously on a population whose capacity to manage them was itself being degraded by those same conditions. The technology that increased cognitive load also disrupted sleep, which reduced cognitive resilience. The economic conditions that produced financial anxiety also produced time scarcity, which made recovery and social connection harder to sustain. The social media environment that intensified loneliness also normalized a level of constant stimulation that made solitude feel intolerable rather than restorative.
Psychologist Martin Seligman, who developed what he called the PERMA model of wellbeing — Positive emotion, Engagement, Relationships, Meaning, and Achievement — had argued for years that human flourishing requires not just the absence of distress but the active presence of positive experiences along multiple dimensions. By 2019, many of those dimensions were under simultaneous pressure. Work was less likely to provide engagement and meaning. Relationships were thinner and more digitally mediated. Positive emotion was harder to sustain in an environment designed to capture attention through negative affect.
The result was a population that was not, in most cases, clinically ill but was functioning well below its potential — chronically understimulated in the ways that matter for wellbeing, chronically overstimulated in ways that deplete it. A quiet crisis, spread so broadly that it was in danger of being mistaken for normality.
Who Bore the Weight
The exhaustion of 2019 was widespread, but it was not evenly shared. A useful principle for understanding its distribution is this: exhaustion accumulates fastest where chronic demands consistently exceed available recovery resources. By that measure, certain groups were operating under conditions of structural disadvantage that amplified every other stressor the culture imposed.
Women carried a larger share of what sociologists call “emotional labor” — the work of managing feelings, maintaining relationships, and attending to the emotional needs of others — both within families and in the workplace. Research following Arlie Hochschild’s 1989 book “The Second Shift” had continued to document an unequal division of domestic and cognitive labor, with studies showing that the mental load of managing household logistics, childcare, and family relationships still fell disproportionately on women even when both partners worked full-time. The demands on women were higher; the recovery time and autonomy afforded to them was frequently lower. The gap between what was asked and what was replenished was, for many, a defining feature of daily life.
For Black Americans and other people of color, the calculus was different but the direction was the same. Researchers had documented what Arline Geronimus termed “weathering” — the accelerated physiological aging produced by chronic exposure to discrimination, systemic disadvantage, and the ongoing hypervigilance required to navigate a society structured by racial inequality. The biological markers were measurable: higher allostatic load, earlier onset of age-related health conditions, shorter telomeres. The demands here were not just occupational or domestic but existential — the persistent cost of managing identity and safety in environments that regularly signaled threat.
Essential workers — teachers, home health aides, long-haul drivers, grocery clerks — faced the same fundamental imbalance from yet another angle: high demand, low control, and limited compensation. Decades of research on workplace stress, beginning with Robert Karasek’s job strain model in the 1970s, had established that the most psychologically damaging work environments are not necessarily the most intense, but those that combine high demands with low autonomy. By 2019, that combination was endemic across large sectors of the workforce. The groundwork for the acute crisis that would emerge during the pandemic was already laid, in the bodies of people who had been running past capacity for years.
What Came Next — and What It Revealed
The arrival of COVID-19 in 2020 did not create a new crisis of human exhaustion so much as it removed whatever mechanisms people had been using to hold things together. The commute that had been onerous was also, for some, the only hour of the day spent in genuine solitude. The office that had been stressful had also provided a structure that organized time and social interaction. When those structures disappeared and the global crisis added layers of grief, fear, economic disruption, and political conflict to an already burdened population, the underlying fragility became visible.
The phenomenon of “languishing” — a term popularized by organizational psychologist Adam Grant in a widely read 2021 New York Times essay — described what many people were feeling: not clinical depression, but a loss of vitality and meaning, a functional depletion that sat below the threshold of formal diagnosis but above the threshold of ordinary resilience. Grant was drawing on Seligman’s work on flourishing and Corey Keyes’s research on mental health as a positive state, not merely the absence of illness. What he was naming had, in many ways, been present before the pandemic. The pandemic had simply stripped the insulation from it.
The years since have not produced a reversal. The automation anxiety that was still largely speculative in 2019 became considerably more concrete after 2022, when large-scale AI systems began demonstrating capabilities that placed real pressure on knowledge work — the sector that had previously felt most insulated. The social media landscape grew more immersive and more contentious. The political environment in much of the developed world remained in a state of sustained conflict that demands cognitive and emotional resources from anyone paying attention. Sleep deprivation, still a reliable index of societal stress, remains a widespread and underaddressed public health problem.
Why This History Matters
Understanding that humans were already emotionally exhausted before the crises of the 2020s arrived is not an exercise in nostalgia or complaint. It is, rather, a necessary correction to the narrative that each successive wave of difficulty is a discrete new problem, caused by specific recent events and therefore amenable to targeted solutions. The exhaustion that characterized 2019 was structural. It arose from the intersection of biological constraints, economic conditions, technological design choices, and social changes that had been developing over decades.
That structural understanding matters because it points toward the kinds of interventions that might actually help — and away from the ones that merely manage symptoms. Individual wellness practices have value, but they are not substitutes for addressing the conditions that produce exhaustion at scale. Economic security reduces allostatic load more reliably than any app. Real social connection, of the face-to-face and mutually obligating kind, addresses loneliness in ways that social media engagement cannot. Attention that is genuinely free — not monetized, not gamified, not competing with a notification — is a different kind of experience than the attention management industry claims to sell.
The brain is not infinitely adaptable. The nervous system has genuine limits. A society that consistently operates human beings past those limits will eventually have to reckon with the consequences — in productivity, in health, in the quality of its collective decisions, and in the texture of the lives being lived within it. By 2019, the early stages of that reckoning were already visible, in the data, in the clinics, and in the quiet, bone-deep tiredness that so many people were carrying and so few had yet found adequate language to describe.
