Waking up at night: what is normal and what is not

Updated November 14, 2026 Six Habits Editorial Team

The short answerBrief awakenings at night are a normal part of sleep, especially as we age. Sleep lab data from healthy adults show that time awake after falling asleep naturally increases with age. It becomes a problem when awakenings are long, frequent and cause daytime fatigue. The key is not to panic or check the clock.

Key points

Brief awakenings during the night are normal.
Time awake at night increases with age even in healthy people.
Worrying about waking up itself makes it harder to fall back asleep.
CBT-I helps with frequent, long awakenings.

What the research shows

Sleep runs in cycles of about 90 minutes, and brief awakenings between cycles are normal. Most of them are so short we do not remember them.

Reference data. A study of polysomnography in healthy adults without sleep complaints found that time awake after sleep onset increases steadily with age, while deep sleep decreases (Hertenstein et al., 2018).

Meta-analysis. A meta-analysis of sleep studies from childhood to old age showed that total sleep time, sleep efficiency and deep sleep decline with age, while awakenings increase (Ohayon et al., 2004).

What helps

Do not look at the clock.
If you cannot fall back asleep within about 20 minutes, get up, go to another room and do something calm in dim light until you feel sleepy.
Avoid screens and bright light during the night.
Limit fluids in the 2 hours before bed and alcohol in the evening.
If awakenings are frequent and long, CBT-I is the most effective treatment (Trauer et al., 2015).

Frequently asked questions

Is waking at 3 a.m. a sign of something wrong?

Not necessarily. Brief awakenings between sleep cycles are normal; they only matter if you cannot fall back asleep and feel tired during the day.

Should I check the time when I wake up?

No. Clock-watching increases anxiety. Turn the clock away from the bed.

Sources

Hertenstein et al. (2018). Reference Data for Polysomnography-Measured and Subjective Sleep in Healthy Adults. Journal of Clinical Sleep Medicine 14(4):523-532. doi:10.5664/jcsm.7036
Ohayon et al. (2004). Meta-Analysis of Quantitative Sleep Parameters From Childhood to Old Age in Healthy Individuals: Developing Normative Sleep Values Across the Human Lifespan. Sleep 27(7):1255-1273. doi:10.1093/sleep/27.7.1255
Trauer et al. (2015). Cognitive Behavioral Therapy for Chronic Insomnia. Annals of Internal Medicine 163(3):191-204. doi:10.7326/M14-2841

Prepared according to our evidence methodology and the principles of lifestyle medicine. For education only; it does not replace advice from your doctor.

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Waking up at night: what is normal and what is not

Key points

What the research shows

What helps

Frequently asked questions

Sources

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