Want to Live Longer? Sleep is the Key

Sleep tends to fall into the same category as flossing: Everyone knows it's a good thing to do more of, but nobody seems to find the time. The effects of sleep deprivation are generally thought to be related to things like brain power and focus.

But recent research paints a rather more alarming picture. Not getting enough sleep may shave years off your life, and harm your heart, brain, and mind in different ways.

Sleep Beats Diet and Exercise as a Longevity Factor

A groundbreaking study published in December 2025 examined data on life expectancy and sleep across more than 3,000 counties in the US, using six years of data from CDC surveys.¹

The researchers discovered that sleep functions as a critical life span predictor because its connection to life span development proved stronger than dietary, exercise and social isolation factors.

"I didn't expect it to be so strongly correlated to life expectancy," said senior author Andrew McHill, PhD, associate professor at the OHSU School of Nursing, Oregon. "The strength of sleep's connection to life duration surprised me as a sleep scientist who knows about sleep's health advantages."

The study established that most US states experienced life expectancy decline because of inadequate sleep from 2019 to 2025, which remained consistent across all income groups and healthcare access levels and geographic regions.

The Magic Number Is Seven Hours

Researchers established insufficient sleep when people slept less than seven hours each night, which led to evidence showing that people who consistently failed to reach this threshold experienced shortened life spans.

The American Academy of Sleep Medicine establishes their sleep requirement for adults at seven to nine hours of sleep daily.

The new understanding shows how the number directly relates to your actual lifespan because it serves as the most powerful population-level lifespan prediction measure throughout history.

McHill explained that people see sleep as an unimportant activity, which they can skip because they believe they can make up for lost sleep during the next day or their weekend time.

Your Brain Is Literally Cleaning Itself While You Sleep

Deep sleep causes the brain to perform its essential functions. During sleep your brain creates memories while it eliminates waste materials, which removes toxic proteins that include Alzheimer's disease-related substances, and undergoes a system restore process. Deep sleep achieves essential physical and mental recovery.

Research also shows that a reduction in slow-wave sleep and Rapid Eye Movement (REM) sleep is linked to brain atrophy in parts of the brain that are particularly vulnerable to Alzheimer's disease. In simple terms, missing deep sleep may actually hasten the onset of dementia.

The Vicious Cycle of Poor Sleep and Mental Health

Individuals suffering from insomnia are 10 times more prone to depression and 17 times more prone to anxiety than the general population. While the link between sleep and mental health is two-way, sleep is the easier of the two problems to address.

Research shows that improving sleep also improves symptoms of depression and anxiety disorders, with the improvement in sleep linked to the improvement in mental health.

In addition, a Stanford University research also shows that going to bed early is better for mental health, even if you think of yourself as a night owl, as a late bedtime is linked with a higher risk of depression and anxiety disorders regardless of your natural sleep preference.

Your Heart, Immune System, and Weight Are Also at Risk

Chronic sleep deprivation leads to increased blood pressure, imbalance of hunger hormones, which makes overeating much more probable, and a weakened immune system.

Researchers have identified two diseases, obesity and diabetes, which they believe have a strong connection with sleep deprivation and could independently contribute to a reduction in life expectancy.

A study published in the Journal of Medical Internet Research in late 2025 reported that variability in sleep patterns, night-to-night differences in sleep and wake times, was linked with the risk of sleep apnea and high blood pressure, even when people got a decent number of hours of sleep. Consistency is important too.²

Practical Ways to Actually Sleep Better

·       Set a regular bedtime, including on weekends. Your body's internal clock works best when it has regular anchors.

·       Engage in regular physical activity. Young adults got better sleep quality with as little as 10 minutes of moderate daily physical activity.

·       Stop screens at least an hour before bedtime. Screens emit blue light, which delays the onset of deep sleep.

·       Keep the room cool and dark. Deep sleep occurs when the core body temperature drops slightly. Thus, a cool room is necessary.

The 2025 study also found that sleep ranks alongside diet and exercise as a longevity factor, and in some cases, sleep ranks higher.  

"Getting a good night's sleep will improve how you feel but also how long you live," said McHill.

Seven to nine hours of sound sleep each night is not a luxury. It is a powerful tool for health.

Disclaimer: This content is for general informational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider with any questions about your health or treatment options.

References

1. Oxford Academic | Sleep is a critical life span predictor

2. JMIR| Sleep deprivation may cause diabetes, obesity