REM Sleep by Age: How Your Sleep Changes From Infancy to Later Life

A newborn, a teenager and a grandparent all sleep, but they sleep in very different ways. The amount of sleep you need, the timing of your body clock and the mix of sleep stages, including REM sleep, all shift across a lifetime. Knowing what is typical for each stage of life can help you set realistic expectations and spot when something is worth checking with a doctor.

This guide gives a plain-language overview of how sleep, and REM sleep in particular, changes with age. The figures here are broad, typical ranges rather than precise targets.

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Recommended sleep by age

The American Academy of Sleep Medicine and the National Sleep Foundation have published age-based recommendations for total sleep. Broadly:

Individual needs vary, and these ranges describe healthy people. Some health conditions change sleep needs.

Infants: the most REM-heavy stage of life

Newborns spend a very large share of their sleep in active sleep, the infant form of REM sleep, often around half of total sleep. Babies also enter active sleep quickly after falling asleep, unlike adults. Their sleep cycles are shorter than an adult’s, and they wake frequently for feeding.

Researchers believe the high amount of REM-like sleep in infancy is linked with rapid brain development, though exactly how is still being studied. Over the first years of life the proportion of REM sleep falls steadily, and sleep consolidates into longer nighttime stretches.

For infant sleep safety and specific advice, follow guidance from your pediatrician.

Children: deep sleep at its peak

Young children typically get large amounts of deep, slow-wave sleep, which is one reason a sleeping child can be so hard to wake. REM sleep continues to decline as a share of sleep through early childhood, settling closer to adult proportions by later childhood.

Children are also prone to certain non-REM sleep events like sleepwalking and night terrors, which usually happen in the first part of the night during deep sleep. Nightmares, which come from REM sleep, tend to happen later in the night. Most children grow out of these, but frequent or concerning episodes are worth discussing with a pediatrician.

Teenagers: a later body clock

During adolescence, the body clock typically shifts later. Many teenagers genuinely find it hard to fall asleep early and hard to wake early. Combined with early school start times, homework, sports and phones, this often leads to chronic short sleep.

Because REM sleep is concentrated toward morning, early alarms can cut into it significantly for teenagers. Protecting a consistent schedule and limiting screens late at night can help. See phones, screens and REM sleep.

Adults: REM around a fifth to a quarter of sleep

In healthy adults, REM sleep commonly makes up roughly 20 to 25 percent of total sleep. Deep sleep is typically highest in young adulthood and declines gradually from there. Most adults move through four to six sleep cycles a night, each lasting around 90 minutes on average, with REM periods getting longer toward morning.

Common adult sleep disruptors include work stress, caregiving, alcohol, late caffeine, irregular schedules and a warm bedroom. Our guides on stress and REM sleep, alcohol and REM sleep, caffeine and REM sleep and how sleep temperature affects REM sleep cover each of these.

Midlife: hormones and life changes

Midlife often brings changes that affect sleep. For many women, perimenopause and menopause bring hot flashes and night sweats that can wake them during the night. Men and women alike may notice more frequent waking, lighter sleep or snoring that gets worse with age or weight gain.

Snoring with pauses in breathing, gasping or choking can be a sign of obstructive sleep apnea, which becomes more common with age and is worth checking with a doctor.

Older adults: lighter, more broken sleep

In later life, sleep tends to become lighter and more fragmented. Deep sleep declines further, and people often wake more during the night. The body clock may shift earlier, so many older adults feel sleepy in the early evening and wake early in the morning.

The proportion of REM sleep tends to be relatively stable through much of adulthood, with modest declines in older age in some studies. Getting less total sleep or waking more often can still reduce the REM people actually get.

It is a common myth that older people need much less sleep. Sleep recommendations for adults over 65 remain around seven to eight hours. What changes is often the ability to get that sleep in one consolidated block.

When age-related changes are not “just aging”

Some changes deserve attention at any age:

• Loud snoring, pauses in breathing or gasping during sleep
• Physically acting out dreams, such as kicking or punching. This can be a sign of REM sleep behavior disorder, which is most common in adults over 50
• Strong urges to move the legs in the evening (possible restless legs syndrome)
• Severe daytime sleepiness despite enough time in bed
• Insomnia lasting more than a few weeks

Talk to a doctor about any of these.

How to support REM sleep at any age

The fundamentals are the same throughout life:

• Keep a steady schedule. Consistent wake times anchor the body clock. See sleep schedule.
• Get daylight early. Morning light helps keep the circadian rhythm on track, which is especially helpful for teens and older adults.
• Allow enough time in bed. REM is concentrated late in the night, so short nights cut it first.
• Keep the bedroom cool, dark and quiet. See sleep environment.
• Be careful with alcohol and late caffeine. Both can disrupt sleep architecture.
• Stay active during the day. Regular physical activity is associated with better sleep quality, though very intense exercise right before bed can be stimulating for some people.
• Review medications. Some medications affect REM sleep. Ask your doctor or pharmacist if you suspect a medication is affecting your sleep, and do not change doses on your own.

How REM sleep timing changes

It is not only the amount of REM sleep that changes over a lifetime but also its timing. Infants can enter active sleep almost immediately after falling asleep. In adults, the first REM period usually appears about an hour or more after sleep begins, and the longest REM periods come in the early morning.

In older adults, a body clock that runs earlier can move the whole night forward. Someone who falls asleep at 9 p.m. and wakes at 4 a.m. may still get a reasonable amount of REM, but if they go to bed late for a social event and still wake at 4 a.m., REM is likely to be cut short. Keeping a steady bedtime matters as much as a steady wake time in later life.

Sleep tips by life stage

For parents of young children

A predictable bedtime routine, such as a bath, a book and lights out at a similar time each night, helps children settle. Keep screens out of the bedroom where possible. Your pediatrician can help with persistent sleep problems.

For teenagers

Aim for a consistent schedule even on weekends, get bright light in the morning, and charge phones outside the bedroom at night. If school starts very early, protecting bedtime is the most realistic way to protect REM sleep.

For working adults

Treat sleep as a scheduled appointment. Build in a wind-down period, keep alcohol and caffeine in check, and keep the bedroom cool. See our how to get more REM sleep guide for a full checklist.

For older adults

Get daylight and physical activity during the day, keep naps short and early, and limit fluids in the last couple of hours before bed if nighttime bathroom trips wake you. Talk to your doctor about medications that might affect sleep.

The role of daylight at every age

Across every life stage, light is the strongest signal for the body clock. Children who play outside, teenagers who get morning light before school, working adults who take a walk at lunch, and older adults who spend time outdoors in the morning all give their internal clock a clear daytime signal. That makes it easier to feel sleepy at night and to get consolidated sleep, including the REM-rich cycles toward morning.

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