The Truth About Biphasic Sleep As You Get Older

Waking up in the middle of the night and struggling to fall back asleep can be frustrating, especially as you get older. But what if sleeping in two separate periods is not necessarily a sign of poor sleep?

This pattern, known as biphasic sleep, occurs when a person regularly sleeps during two distinct periods within a 24-hour day. Some people sleep for four or five hours, wake up for a while, and then return to bed for another stretch of sleep. Others sleep through most of the night and take a consistent afternoon nap.

Although uninterrupted nighttime sleep is often considered ideal, sleep patterns can change with age. The important question is whether you are getting enough restorative sleep and functioning well during the day—or whether an underlying problem is disrupting your rest.

Why Biphasic Sleep May Become More Common With Age

As people grow older, their sleep architecture and internal body clock can change. These changes may make nighttime sleep lighter and more easily interrupted.

Several factors can contribute to this pattern.

First, older adults generally spend less time in deep sleep. As a result, noises, movement from a sleeping partner, or the need to use the bathroom may wake them more easily.

Second, the body's sleep pressure—the biological drive to sleep that builds during waking hours—gradually decreases while you sleep. After several hours of rest, you may temporarily feel more alert, even if your body still needs additional sleep.

Your circadian rhythm, which regulates the timing of sleep and wakefulness, may also shift earlier with age. You might become sleepy at 8 or 9 p.m. rather than 10 or 11 p.m. If you go to bed earlier, you may also wake up earlier in the morning.

Together, these changes can contribute to a pattern of sleeping in two separate periods.

Historically, some people may also have practiced a first and second sleep, with a period of wakefulness in between. This suggests that consolidated sleep is not necessarily the only pattern the human body can follow.

However, waking frequently is not always harmless. The cause and the effect on your daily functioning matter more than the sleep pattern alone.

When Sleeping in Two Periods May Be Normal

Not everyone who wakes up in the middle of the night has insomnia.

Consider two different situations.

In the first, you sleep for several hours, wake up feeling calm, read quietly or use the bathroom, and return to sleep when you feel tired again. You get enough total sleep and feel reasonably refreshed the following day.

In the second, you wake up exhausted, repeatedly check the clock, worry about how little sleep you are getting, and remain awake for hours. The following day, you struggle with fatigue, concentration, or mood.

These experiences are not the same.

If your sleep naturally divides into two predictable periods, you obtain sufficient rest overall, and you function well during the day, the pattern may not require treatment.

But if waking up is accompanied by distress, persistent exhaustion, or difficulty performing everyday activities, it is worth investigating the cause.

The goal is not necessarily to force your body into one continuous block of sleep. It is to obtain sufficient, restorative sleep that supports your health and daily life.

Warning Signs You Should Not Ignore

Although biphasic sleep can be a normal variation, certain symptoms deserve medical attention.

1. A sudden change in your sleep pattern

If you have slept reasonably well for years and suddenly begin waking for long periods every night, consider what may have changed. New medications, pain, stress, illness, or other health conditions can interfere with sleep.

2. Persistent daytime sleepiness

Regularly falling asleep unintentionally, struggling to stay awake, or feeling exhausted despite spending enough time in bed may indicate that your sleep quality or quantity is inadequate.

3. Difficulty returning to sleep

A calm period of nighttime wakefulness is different from lying awake for hours, feeling increasingly anxious or frustrated. Persistent difficulty falling or staying asleep may be a sign of insomnia.

4. Signs of sleep apnea

Loud snoring, gasping or choking during sleep, morning headaches, and breathing pauses noticed by a partner may indicate obstructive sleep apnea. This condition can interrupt sleep repeatedly and should not be dismissed as a normal consequence of aging.

Frequent nighttime urination, chronic pain, and medication side effects can also disrupt sleep.

If these symptoms occur regularly, speak with a health care professional rather than assuming that your sleep pattern is simply changing with age.

How to Improve Your Sleep After 60

If you want to sleep more continuously through the night, several adjustments may help. However, the best approach depends on why you are waking up.

Keep a consistent wake-up time.

Try to get up at approximately the same time every morning, including after a poor night's sleep. A regular schedule helps reinforce your body's circadian rhythm.

Avoid going to bed excessively early.

Going to bed much earlier to compensate for a difficult night can sometimes increase the amount of time you spend awake in bed. Instead, aim for a bedtime that allows adequate sleep while matching your natural sleepiness.

Be mindful of naps.

Naps can be useful, particularly when you feel tired during the day. However, long naps or naps late in the afternoon may reduce your sleep pressure and make it harder to remain asleep throughout the following night.

If nighttime sleep is a concern, consider shorter, earlier naps and observe whether your sleep improves.

Do not panic when you wake up.

Checking the clock repeatedly and calculating how many hours remain before morning can increase anxiety, making it harder to fall asleep again.

If you are awake and becoming frustrated, consider getting out of bed temporarily to read or do another quiet activity in dim light. Return to bed when you feel sleepy.

Avoid bright lights and stimulating activities that may make you more alert.

Address underlying health problems.

If pain, frequent urination, medication effects, or possible sleep apnea is interfering with your rest, improving sleep may require treating the underlying issue. Discuss persistent symptoms with your health care provider.

For chronic insomnia, cognitive behavioral therapy for insomnia, known as CBT-I, is a well-established treatment that helps people change sleep-related habits and thought patterns.

Is Biphasic Sleep Healthy?

The answer depends on the individual.

Sleeping in two periods is not automatically unhealthy if the pattern is predictable, you obtain enough total sleep, and you feel rested and function well during the day.

Likewise, sleeping in one continuous block does not guarantee good-quality sleep. Someone may spend eight hours in bed but still experience frequent breathing interruptions or other problems that prevent restorative rest.

Most adults should aim for at least seven hours of sleep regularly, although individual needs vary. Older adults commonly need around seven to nine hours.

If your sleep is divided but you feel well, there may be no compelling reason to change it. On the other hand, if the pattern interferes with your schedule, relationships, or daytime energy, it is reasonable to explore ways to improve it.

There is no universal sleep schedule that works perfectly for everyone.

Listen to Your Body, but Know When to Seek Help

As you age, your body may not sleep in exactly the same way it did in your 30s or 40s. That does not automatically mean something is wrong.

Instead of judging your sleep solely by whether you remain asleep all night, pay attention to the bigger picture: how much you sleep, how rested you feel, and how well you function during the day.

A predictable pattern of nighttime wakefulness followed by a second period of sleep may be perfectly manageable. Persistent insomnia, severe daytime fatigue, or symptoms of sleep apnea deserve a closer look.

The goal is not to achieve perfect sleep. It is to get the restorative rest your body needs to support your health, memory, mood, and quality of life.