The COVID-19 pandemic reshaped daily human behavior on a scale rarely seen outside wartime. Within weeks of the first lockdowns, people worldwide shifted how they slept, ate, worked, moved, socialized, and even dreamed. Some of these changes were deliberate responses to public health guidance, while others crept in as side effects of confinement and stress. The picture is more complex than a simple story of people staying home and washing their hands more, and many of the shifts persisted well beyond the end of formal restrictions.
What Made People Follow the Rules, and What Didn’t
Early in the pandemic, compliance with public health measures like social distancing and mask-wearing was strongly tied to social norms and trust. A cross-country analysis of more than 15,000 people found that perceiving others around you as following preventive measures was one of the strongest predictors of your own compliance. Concern about harm to others, trust in government and the scientific community, and even stress levels all pushed people toward following guidelines.1Current Psychology. Predictors of compliance with COVID-19 guidelines across countries: the role of social norms, moral values, trust, stress, and demographic factors Both the strictness of a policy and the degree to which the public actually followed it shaped whether interventions like social distancing worked as intended.2PubMed Central. Public Compliance Matters in Evidence-Based Public Health Policy: Evidence from Evaluating Social Distancing in the First Wave of COVID-19
Trust in institutions played a particularly important role. People who trusted their government and medical authorities were more likely to socially distance, wear masks, and eventually get vaccinated.3Journal of Emergency Management. Patterns of Institutional Trust During COVID-19 Conspiracy theories worked in the opposite direction. Those who endorsed COVID-19 conspiracy beliefs were less likely to comply with preventive measures, and this relationship operated partly through reduced trust in government officials.4PubMed Central. Beliefs in COVID-19 conspiracy theories, compliance with the preventive measures, and trust in government medical officials Even though conspiracy beliefs were held by a minority, the behavioral consequences were measurable: believers were less likely to wear masks, maintain distancing, or accept vaccination.5PubMed Central. Public policy and conspiracies: The case of mandates One U.S. study tracked the effect over time and found that conspiracy beliefs in March 2020 predicted reduced mask-wearing months later in July, with the cumulative relationship growing more than five times stronger over that period.6Social Science & Medicine. Conspiracy theories as barriers to controlling the spread of COVID-19 in the U.S.
How Sleep Changed
One of the most universal behavioral shifts was in sleep patterns. The pandemic pushed people toward later bedtimes and later wake times, a phenomenon researchers dubbed “coronasomnia.” With commutes eliminated and schedules loosened, most people drifted toward a later sleep-wake cycle, though healthcare workers were an exception because their schedules remained rigid or became more demanding. Sleep quality, paradoxically, got worse for many despite more time in bed. Women were disproportionately affected, in part because of pre-existing vulnerability to insomnia and added stressors like family caregiving and lockdown-related anxiety.7PubMed Central. Unveiling Coronasomnia: Pandemic Stress and Sleep Problems During the COVID-19 Outbreak
The shift to later timing had a surprising wrinkle. A multinational survey found that while most participants reduced their “social jetlag,” the mismatch between their natural sleep timing and their work-imposed schedule, any disruption to usual patterns was associated with insomnia symptoms. People who shifted their sleep timing in either direction, later or earlier, had roughly 23 to 54 percent higher odds of moderate-to-severe insomnia compared with those whose schedules stayed the same.8PubMed Central. Social Jetlag Changes During the COVID-19 Pandemic as a Predictor of Insomnia – A Multi-National Survey Study
Dreams changed too. People reported more frequent dreaming and more nightmares. In Italy, researchers found that the general population was having more frequent nightmares during the pandemic compared with pre-pandemic norms, with young people, women, and those who had lost their jobs or knew someone infected reporting the most emotionally intense dream content.9PubMed Central. Pandemic nightmares: Effects on dream activity of the COVID-19 lockdown in Italy Stress, depression, and anxiety during lockdowns were all linked to higher rates of bad dreams and nightmares, including dreams about death, inefficacy, and the pandemic itself.10PLoS ONE. Stuck in a lockdown: Dreams, bad dreams, nightmares, and their relationship to stress, depression and anxiety during the COVID-19 pandemic Qualitative research framed the surge in distressing dream content as a reflection of the pandemic’s traumatic nature, with unprocessed daytime experiences replaying in sleep in ways that resembled post-traumatic stress symptoms.11PubMed Central. Dreaming during COVID-19: the effects of a world trauma
Screens Took Over
Screen time surged across nearly every age group, but the increase was especially dramatic for children and adolescents. A meta-analysis of studies covering the pandemic period found that children’s total daily screen time rose by about 84 minutes per day from a pre-pandemic baseline of roughly 2.7 hours, with both handheld devices and personal computers each contributing about 45 extra minutes.12JAMA Pediatrics. Assessment of Changes in Child and Adolescent Screen Time During the COVID-19 Pandemic: A Systematic Review and Meta-analysis A German study showed that recreational screen time jumped by about an hour per day during lockdown, with teenagers aged 14 to 17 seeing the steepest decline in meeting recommended screen time limits.13Scientific Reports. Physical activity and screen time of children and adolescents before and during the COVID-19 lockdown in Germany: a natural experiment Among U.S. adolescents in a large cognitive development study, participants reported an average of nearly 8 hours per day of screen use, dominated by video streaming, multiplayer gaming, and single-player gaming.14JAMA Pediatrics. Screen Time Use Among US Adolescents During the COVID-19 Pandemic: Findings From the Adolescent Brain Cognitive Development Study
For adults, the explosion in videoconferencing introduced a new kind of exhaustion. Researchers developed a formal framework for what became colloquially known as “Zoom fatigue,” drawing on neuroscience and behavioral science to explain why hours of video calls felt more draining than equivalent in-person interaction. The unnatural demands of staring at faces on a grid, the slight audio delays that disrupt conversational rhythm, and the self-consciousness of watching your own image all contributed to a distinct form of cognitive overload.15PubMed Central. On the stress potential of videoconferencing: definition and root causes of Zoom fatigue
The mental health costs of all that screen time were not evenly distributed. A study using daily diary data found that social media consumption during the pandemic was associated with increased symptoms of depression and post-traumatic stress, and this link was stronger for people with histories of childhood maltreatment. Traditional media consumption, like television news, did not show the same pattern.16PubMed Central. Doomscrolling during COVID-19: The negative association between daily social and traditional media consumption and mental health symptoms during the COVID-19 pandemic
Bodies Moved Less, and Diets Shifted
Physical activity dropped substantially during lockdowns. A cross-national study found a reduction of roughly 2,000 steps per day across countries, with young adults showing the largest drop in unplanned physical activity and the sharpest increases in sedentary behavior.17BMC Public Health. Physical activity and mental well-being under COVID-19 lockdown: a cross-sectional multination study A systematic review covering nearly 87,000 participants across 66 studies confirmed that sedentary behavior climbed during lockdowns, though the picture varied. In Belgium, for instance, overall physical activity did not change significantly while sedentary time still rose, suggesting people sat more without necessarily exercising less.18PubMed Central. The Influence of COVID-19 Lockdown on Physical Activity, Sedentary Behavior and Social Support Specific to Physical Activity Among Belgian Adults
Eating habits shifted in parallel. Emotional eating became more prevalent, and research traced much of its increase back to pandemic-related stress. One study found that about 61 percent of the link between perceived pandemic stress and emotional eating could be explained by symptoms of addiction to ultra-processed foods, suggesting that stress drove people toward highly palatable, processed options.19PubMed Central. Addiction to ultra-processed foods as a mediator between psychological stress and emotional eating during the COVID-19 pandemic Emotional eaters reported consuming more food overall, eating more sweets and desserts, ordering more food delivery, sleeping worse, and eating fewer vegetables.20Food Quality and Preference. Cognitive restraint, emotional eating and uncontrolled eating: Exploring factors associated with the cycle of behaviors during the COVID-19 pandemic
Alcohol and Substance Use
Drinking patterns changed in ways that were less about volume and more about context and motivation. In a Greek study of over 700 adults, the types of drinks people consumed stayed broadly similar, but far more people drank alone (rising from about 8 percent to 29 percent) and at home rather than with friends. Among those who increased their drinking, the top reasons were isolation, changes in daily routine, and coping with anxiety or depression.21Toxicology Reports. COVID-19 pandemic and alcohol consumption: Impacts and interconnections Across broader evidence, mental health factors were the most common triggers for increased use of both alcohol and other substances.22PubMed Central. Alcohol and other substance use during the COVID-19 pandemic: A systematic review
Drinking to cope was a particularly risky pattern. One study conducted a year into the pandemic found that coping was the only drinking motive that strengthened the link between COVID-19-related anxiety and alcohol-related problems. People who were already inclined to drink to manage negative feelings were the ones whose pandemic anxiety translated into problematic drinking, while those with other motivations for drinking showed no such escalation.23PubMed Central. Increased alcohol use to cope with COVID-19-related anxiety one year into the coronavirus pandemic
Loneliness, Isolation, and Domestic Violence
The loneliness story was not as straightforward as headlines suggested. A longitudinal study in South Korea found that loneliness did not change significantly over time in the overall population during the pandemic. Loneliness was more closely tied to depression, anxiety, lower education, and lower income than to the pandemic timeline itself. Interestingly, people in their 40s and 60s actually showed significant decreases in loneliness over the course of the pandemic.24Scientific Reports. Longitudinal trajectories of social isolation and loneliness across the lifespan during the COVID-19 pandemic in South Korea This does not mean isolation was harmless. It means loneliness existed before the pandemic and tracked more closely with individual vulnerability than with calendar time.
The consequences of enforced proximity were severe for some households. A systematic review and meta-analysis confirmed that domestic violence increased in response to stay-at-home orders, a pattern observed across multiple cities, states, and countries.25Journal of Criminal Justice. Domestic violence during the COVID-19 pandemic – Evidence from a systematic review and meta-analysis Help-seeking calls rose during the initial pandemic phase, and COVID-specific circumstances like extended confinement, unemployment, school closures, and financial strain all intensified women’s experiences of violence.26PubMed Central. The impact of stay-at-home orders on safety and stability for women
Mutual Aid and Community Building
Not all social changes pointed downward. Mutual aid groups flourished during the pandemic, forming rapidly at the community level to provide practical support like grocery shopping, prescription collection, and check-in calls for vulnerable neighbors.27PubMed Central. How participation in Covid-19 mutual aid groups affects subjective well-being and how political identity moderates these effects These groups met community needs with localized action and resources, building trust and alliances that, in many cases, outlasted the immediate crisis.28PubMed Central. More Than a COVID-19 Response: Sustaining Mutual Aid Groups During and Beyond the Pandemic For participants, the experience often generated a strong sense of group identification. People described a dynamic where if one volunteer could not help, another would step in, creating a reciprocal sense of community belonging that many had not felt before.29PLOS ONE. ‘All together now’: Facilitators and barriers to engagement in mutual aid during the first UK COVID-19 lockdown
Pandemic Fatigue and the Erosion of Compliance
Behavioral adherence did not hold steady. A global analysis of both survey data and mobility records found a U-shaped pattern: compliance with physical distancing dropped gradually over the first five to six months, then partially rebounded around October and November 2020 as case numbers climbed again. Avoidance of gatherings fell by about 0.68 points on a five-point scale over the first 150 to 180 days before recovering somewhat, and mobility data told the same story, with time spent at home dropping and visits to retail and recreation venues climbing before partially reversing.30Nature Human Behaviour. A worldwide assessment of changes in adherence to COVID-19 protective behaviours and hypothesized pandemic fatigue Health authorities warned that this “pandemic fatigue” could undermine compliance with ongoing mandates, and research confirmed it also fueled broader political discontent.31PubMed Central. Pandemic fatigue fueled political discontent during the COVID-19 pandemic
Pets and Mental Health
One widely promoted narrative was that pets buffered loneliness during lockdowns, and adoption rates did spike in many countries. The evidence on mental health benefits, however, was mixed. An Australian study found that pet ownership was actually associated with poorer quality of life during the pandemic, possibly because pets added caregiving burden at a time when owners were already stressed. Pet ownership was not significantly linked to greater resilience or reduced loneliness once situational factors like job loss and mood were accounted for.32PubMed. Pet ownership and mental health during COVID-19 lockdown A longitudinal survey found similar results: pet ownership did not reduce stress or most forms of loneliness, though pet owners did report slightly lower emotional loneliness specifically related to romantic relationship deficits.33PLoS ONE. Temporal patterns of owner-pet relationship, stress, and loneliness during the COVID-19 pandemic, and the effect of pet ownership on mental health
A UK study offered a more nuanced framing. The strength of the bond people felt with their animal did not vary by species, suggesting that the simple presence of an animal companion might matter more than whether it was a dog or cat. But stronger bonds did not translate into better mental health outcomes during lockdown, likely because the positive aspects of companionship were offset by the negative aspects of additional caring responsibilities at a chaotic time.34PLoS ONE. Human-animal relationships and interactions during the Covid-19 lockdown phase in the UK: Investigating links with mental health and loneliness
How People Got Around
Transportation behavior shifted rapidly once lockdowns began. A global analysis of city mobility indexes showed steep declines in walking, driving, and public transit use in March 2020, with gradual recovery starting in April.35The Lancet Public Health. City mobility patterns during the COVID-19 pandemic: analysis of a global natural experiment The recovery was uneven across transport modes. Social media discourse analysis found that people were avoiding public transit and shifting toward private cars, bicycles, and walking, with bicycle sales rising sharply.36PubMed Central. Impacts of COVID-19 on Transport Modes and Mobility Behavior: Analysis of Public Discourse in Twitter A multinational perception study found that the virus’s perceived risk had more effect on bus, train, and car use than on active travel like walking and cycling, suggesting that fear of shared enclosed spaces drove the mode shift more than a general retreat from movement.37Travel Behaviour and Society. Mobility perceptions regarding the COVID-19 pandemic from around the world
Which Behavioral Changes Stuck
One of the most important questions is what happened after restrictions lifted. The answer depends on the behavior. Hand hygiene saw a lasting boost but not at pandemic-peak levels. One survey found that about 82 percent of respondents still washed their hands more frequently than before COVID-19.38PubMed Central. Hygiene Behavior and COVID-19 Pandemic: Opportunities of COVID-19-Imposed Changes in Hygiene Behavior Hospital hand hygiene compliance told a more sobering story: compliance dropped significantly in the post-pandemic phase compared to during the pandemic, from about 90 percent down to about 83 percent in one study.39PLOS One. Hand hygiene after the COVID-19 pandemic: Is it still at a high level? A hospital study comparing pre-pandemic and post-pandemic periods found that hand hygiene adherence was still significantly higher than it had been before COVID-19, with alcohol-based hand rub use increasing more than fourfold, but the gains varied by clinical setting and were only partially sustained.40PLOS Global Public Health. Assessing the COVID-19 legacy on hand hygiene: Retrospective observational before-after study of compliance and alcohol-based
Remote work became one of the most durable behavioral shifts. As the pandemic subsided, many workers returned to the office for some days, but the prevalence of remote and hybrid arrangements appears likely to persist.41Transportation Research Interdisciplinary Perspectives. Change in work arrangement during the COVID-19 pandemic: A large shift to remote and hybrid work Employer surveys reinforce this: some form of hybrid work appears to be becoming the norm rather than the exception.42Transportation Research Part A: Policy and Practice. In-person, hybrid or remote? Employers’ perspectives on the future of work post-pandemic Online shopping followed a similar trajectory. E-commerce adoption accelerated during lockdowns, and consumer research suggests that habits like online purchasing and more cautious spending patterns have largely remained even after physical stores reopened.43Business, Management and Economics Engineering. E-commerce from the customer panel: the phenomenon of the pandemic increase and future challenge
The pandemic, in other words, did not just temporarily rearrange daily life. It accelerated trends that were already in motion, like remote work and online shopping, while leaving behind a complicated residue of better hand hygiene habits, lingering anxiety-driven coping patterns, and a generation of children and adolescents whose relationship with screens was fundamentally altered during formative years. The behavioral shifts that lasted tended to be ones where the new habit was genuinely more convenient or where institutional structures changed to accommodate it. The ones that faded, like peak-level compliance with distancing rules, were sustained by fear and social pressure that naturally ebbed as the acute threat receded.