Why We Sleep Worse Than 100 Years Ago: The Rise of Modern Sleep Disorders

Spring fatigue isn’t just a fleeting case of the Mondays—it’s a biological disruption that can leave even the most disciplined among us feeling like we’ve been hit by a mini jetlag. Scientists now describe this seasonal dip in energy as a modern phenomenon, one that mirrors the sleep disturbances caused by rapid time-zone shifts, but without the travel. The difference? Unlike jetlag, spring fatigue is self-inflicted, woven into the fabric of our 24/7 lifestyles, artificial lighting, and the relentless pace of contemporary life.

But why does it happen? And more importantly, how can we reset our internal clocks to reclaim restorative sleep? The answers lie in understanding how sleep—once dictated by natural light cycles—has become a battleground between ancient biology and modern convenience. Research confirms what many have long suspected: the sleep disorders we see today are often products of a world that no longer aligns with our bodies’ evolutionary rhythms.

For Dr. Monica L. Andersen, a sleep researcher at the Universidade Federal de São Paulo, the disconnect is stark. “Modern humans sleep less than their ancestors, and the consequences ripple across physical and mental health,” she told World Today Journal. “The problem isn’t just that we’re staying up later—it’s that we’ve rewired our relationship with darkness itself.” Her findings, published in Sleep Science, underscore how artificial light exposure at night suppresses melatonin, the hormone critical for sleep onset, effectively tricking our brains into believing it’s daytime.

Why Spring Fatigue Feels Like Jetlag—and How to Fight Back

The term “spring fatigue” may sound like a casual observation, but sleep scientists classify it as a form of social jetlag—a misalignment between our internal circadian rhythms and the demands of modern schedules. Unlike traditional jetlag, which occurs after crossing time zones, social jetlag is the result of chronic sleep restriction during the week followed by “recovery” sleep on weekends. A 2023 study in Preventing Chronic Disease, published by the U.S. Centers for Disease Control and Prevention (CDC), linked this pattern to increased risks of obesity, diabetes, and cardiovascular disease. The editorial noted that “the bidirectional relationships between sleep, mental health, and chronic disease have garnered considerable attention in recent years,” with sleep health now recognized as a national imperative.

What’s changed in the last century? Before electric lighting and digital screens, humans naturally followed the sun’s rhythm—going to bed when it grew dark and waking with dawn. Today, the average person in industrialized nations gets less than seven hours of sleep per night, according to Andersen’s research, despite biological needs for closer to eight. The result? A cascade of sleep disturbances that mimic jetlag symptoms: grogginess, irritability, difficulty concentrating, and even mood disorders.

How Artificial Light and Modern Life Disrupt Sleep

The primary culprit is artificial light, particularly the blue-light spectrum emitted by screens and LED bulbs. Studies confirm that exposure to these wavelengths within two hours of bedtime delays melatonin production by up to 90 minutes, effectively postponing the body’s readiness to sleep. Coupled with erratic work hours, caffeine consumption, and the cultural glorification of productivity, the result is a perfect storm of sleep deprivation.

Dr. Sergio Tufik, co-author of the Sleep Science study and director of the Sleep Institute in São Paulo, explains that “the human body wasn’t designed for this level of light pollution. Our ancestors hunted by daylight and rested in complete darkness. Today, we’re bathed in artificial light 24/7, and our brains are confused.” The institute’s research found that individuals exposed to bright artificial light at night were three times more likely to report insomnia compared to those who maintained darker evenings.

Practical Steps to Reset Your Sleep Clock

If spring fatigue feels inescapable, the good news is that slight, science-backed adjustments can help realign your internal clock. Here’s how:

• Prioritize darkness: Blackout curtains or a sleep mask can help signal to your brain that it’s time to rest, even in urban environments.
• Limit screen time: Avoid electronic devices at least one hour before bed. If you must use them, enable night-mode filters to reduce blue-light exposure.
• Stick to a schedule: Go to bed and wake up at the same time every day—even on weekends—to reinforce your circadian rhythm.
• Optimize your environment: Keep your bedroom cool (around 18–22°C or 64–72°F) and quiet to promote deeper sleep.
• Watch your caffeine: Avoid coffee, tea, and energy drinks after 2 p.m., as caffeine can linger in your system for up to eight hours.

For those struggling with persistent sleep issues, consulting a sleep specialist may be necessary. The CDC’s Preventing Chronic Disease editorial highlights the importance of addressing sleep health as part of broader public health strategies, noting that “comprehensive sleep health interventions could reduce the economic and health burden of chronic diseases by billions annually.”

Who’s Most Affected—and Why It Matters

Spring fatigue doesn’t discriminate, but certain groups are more vulnerable. Shift workers, parents of young children, and individuals with mental health conditions often report higher rates of sleep disruption. A 2023 analysis in Preventing Chronic Disease also found geographic and demographic disparities, with shorter sleep durations more common among low-income populations and racial minorities due to factors like noise pollution, unsafe neighborhoods, and job instability.

“Sleep is a fundamental human need, yet we treat it as a luxury,” says Andersen. “The consequences aren’t just personal—they’re societal. Poor sleep contributes to workplace accidents, reduced productivity, and even societal unrest.” The World Health Organization (WHO) has classified insufficient sleep as a public health priority, linking it to increased risks of dementia, hypertension, and depression.

What’s Next for Sleep Research?

Ongoing studies are exploring innovative solutions, from smart lighting systems that mimic natural light cycles to apps that track sleep patterns and provide personalized recommendations. The Sleep Institute in São Paulo is currently testing a “circadian lighting” intervention in office environments, where artificial light adjusts in sync with the sun to minimize disruption. Early results suggest participants report improved sleep quality and daytime alertness after just four weeks.

Meanwhile, policymakers are beginning to take notice. In 2024, the European Union proposed guidelines to limit blue-light exposure in workplaces, and some U.S. Cities have introduced “dark sky” ordinances to reduce light pollution. The CDC’s editorial calls for “a national imperative” to address sleep health, urging governments to integrate sleep education into public health campaigns alongside diet and exercise.

Key Takeaways: How to Reclaim Restorative Sleep

• Spring fatigue is real—and it’s tied to modern disruptions like artificial light, erratic schedules, and chronic sleep restriction.
• Small changes can make a big difference: Prioritize darkness, limit screens, and maintain a consistent sleep schedule.
• Sleep health is a public issue—poor sleep affects mental health, chronic disease risk, and even economic productivity.
• Innovations like circadian lighting show promise, but personal habits remain the first line of defense.
• If problems persist, seek professional help—sleep specialists can diagnose underlying disorders like insomnia or sleep apnea.

As we move deeper into spring, the key to beating fatigue lies in understanding that rest isn’t a luxury—it’s a biological necessity. By aligning our habits with our bodies’ ancient rhythms, we can turn the tide against modern sleep disorders and reclaim the energy we need to thrive.

Next steps: The next major update on sleep health will come from the World Health Organization’s Global Report on Sleep Disorders, expected in late 2026. In the meantime, readers are encouraged to share their own strategies for better sleep in the comments below—or tag @WorldTodayJournal on social media with #SleepReset.