Why Sleep Gets Worse With Age

Many people describe the same shift somewhere in midlife: bedtime creeps earlier, the night gets choppier and the alarm is often unnecessary. If you’ve wondered why sleep gets worse with age, and what it means for living longer, Humanic Blue starts with this distinction: the change has more than one cause, and not all of them are aging itself.

Aging changes two systems that run sleep. The brain produces less deep, slow-wave sleep, which makes sleep lighter and easier to interrupt. The body clock shifts earlier, pulling bedtime and wake time forward. On top of that, more things can wake you as you get older: a full bladder, pain, breathing pauses from sleep apnea, medications. Large studies suggest that much of the poor sleep older adults report traces to those health problems rather than to age alone. Many of them are treatable.

Below, we take each system in turn and show where age ends and a treatable problem begins.

How does deep sleep change with age?

Sleep pressure is the drive to sleep that builds the longer you’re awake. During deep sleep, also called slow-wave sleep, the brain’s electrical activity moves in large, slow waves. This is one stage of the night’s changing sleep pattern.

A 2004 review combining sleep studies found that healthy adults generally spent less time in deep sleep and more time awake during the night as they aged. After 60, the clearest continuing decline was in sleep efficiency: the share of time in bed actually spent asleep. The review combined older studies, rather than following the same people as they grew older. The full measures and study details are below.

This pattern offers one reason sleep may feel lighter. It does not mean that every nighttime awakening is caused by a loss of deep sleep.

Why might deep sleep decline? A small 2013 brain-imaging study compared younger and older adults. Older adults with less gray matter in an area at the front of the brain tended to have less slow-wave activity during sleep. Differences in that activity were also linked to how well participants remembered word pairs overnight. But the researchers compared people at one point in time. They did not establish that changes in brain tissue caused changes in sleep or memory.

A 2017 narrative review framed an unresolved question: whether older adults need less sleep or have more difficulty generating the sleep they still need. Current National Institute on Aging guidance, reviewed in February 2025, says older adults need about the same seven to nine hours as other adults. That question is covered in How Much Sleep Do You Need as You Age?

System two: the body clock moves earlier

The second system is circadian, the roughly 24-hour internal clock that sets when you feel sleepy and when you wake.

The NIA says older adults tend to go to bed and wake earlier than younger adults.

Jeanne Duffy and colleagues at Brigham and Women’s Hospital and Harvard Medical School explain the connection in a 2015 review. The body clock works with the growing drive to sleep to help set when we sleep and how the night unfolds. Changes in that clock may help explain why sleep shifts with age.

In practice, this is the pattern of the 9 p.m. yawn and the 5 a.m. wide-awake. On its own, an earlier schedule isn’t a disorder. It becomes a problem when your life, or your household, runs on a later one.

How does an earlier body clock differ from difficulty staying asleep?

What else can wake you as you age?

The third system is less about the brain and more about the body around it. With age, more things can pull you out of light sleep.

Breathing. Obstructive sleep apnea repeatedly narrows or closes the upper airway during sleep. A 2013 Wisconsin Sleep Cohort analysis estimated that frequent breathing disruptions during sleep were more common among adults aged 50–70 than among those aged 30–49. The researchers combined laboratory findings with US population data for 2007–2010. The result describes an age pattern in a historical estimate, not today’s national rate. The National Heart, Lung, and Blood Institute lists loud snoring, gasping, daytime sleepiness and waking often to urinate among possible symptoms.

The bladder. Waking at night to urinate is called nocturia. Current NIDDK guidance lists multiple possible contributors to frequent nighttime urination, including urinary infection, kidney disease, heart failure, prostate enlargement, medication or fluid effects and obstructive sleep apnea. A bladder urge may wake someone, but sometimes another disturbance wakes the person first and the bathroom trip follows.

Pain, mood and illness. In the National Sleep Foundation’s 2003 telephone poll of older adults, most reported at least one medical condition. Depression, heart disease, bodily pain and memory problems were associated with more insomnia symptoms. Arthritis, diabetes, lung disease, obesity and other conditions were associated with snoring, reported breathing pauses, restless-legs symptoms or short sleep. The poll asked people about their health and sleep at the same time, so it cannot show which condition caused which sleep complaint.

Medications and alcohol. The NIA advises that medications can affect older adults’ sleep and recommends avoiding alcohol as a sleep strategy. A clinician or pharmacist can review timing, interactions and alternatives; prescribed drugs should not be stopped abruptly without advice. The mechanics are covered in Why Do I Wake Up at 3 AM Every Night?

What age alone doesn’t explain

The 2004 review by Maurice Ohayon and colleagues found that the size of the apparent age differences depended on who was included. Studies did not all exclude the same illnesses, sleep disorders or drug and alcohol use. Some differences blamed on aging could therefore reflect differences in participants’ health. The review cannot put a number on how much change comes from aging and how much from illness.

The same boundary appears in an older population study. Researchers surveyed more than 9,000 adults aged 65 and older in three US communities. More than half reported at least one of five sleep complaints most of the time; 23% to 34% had insomnia symptoms. Complaints were associated with respiratory symptoms, disability, nonprescription medication use, depressive symptoms and poorer self-rated health. The 1995 survey shows that sleep complaints and health problems often occur together. It cannot diagnose the cause of an individual’s sleep problem.

The 2003 poll authors reached the same place: sleep complaints in older adults often come from their other health conditions, not from aging itself.

So aging makes sleep lighter and earlier. Much of what makes it bad is something else, and much of that can be assessed and treated.

How might the answer change when a sleep study includes people with health problems, rather than only healthy volunteers?

Which sleep problems have specific treatments?

Chronic insomnia has an evidence-based initial treatment. The 2025 VA/DoD clinical practice guideline recommends cognitive behavioral therapy for insomnia (CBT-I) and suggests it over medication as first-line treatment. CBT-I works on sleep schedules, habits around bed and thoughts that can keep people awake. General tips about healthy sleep habits are not equivalent to the full treatment.

Apnea requires clinical evaluation and objective testing rather than a consumer tracker’s stage estimate. Nighttime urination, pain and depression each need assessment of their possible causes and appropriate treatment. The common thread is that each is a separate question from age.

A sleep tracker can show that your nights have changed. It can’t tell you which of these systems is responsible, a limit covered in How Much Sleep Do You Need as You Age?