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neüserene · sleep

Sleep is a skill her body remembers.

Cortisol, melatonin and the shape of a night that restores.

1 min read · Reaneu editorial team · 30 May 2026
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Your body keeps time

Your body runs on a 24-hour clock called the circadian rhythm. A small area of the brain keeps it. It tells you when to feel alert and when to feel sleepy.

Light is its main signal. Morning light says it is time to wake. Evening darkness says it is time to wind down.

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Cortisol and melatonin

Cortisol is a hormone with a daily rhythm. It is highest soon after you wake. It falls through the day.

Melatonin works the other way. It rises in the evening, when it gets dark, and helps you feel sleepy. Bright light late at night can delay it.

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The shape of a night

Sleep moves in cycles of about 90 minutes. Each cycle includes light sleep, deep sleep and REM sleep. Most adults complete four to six cycles a night.

Deep sleep comes mostly in the first half of the night. REM sleep, linked with dreaming, comes mostly in the second half. A shortened night mainly costs you REM.

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Habits that help

Adults should aim for at least seven hours. Keep a regular bedtime and wake time. Get daylight in the morning. Dim the lights in the evening.

Keep your bedroom cool, dark and calm. Limit caffeine later in the day. If sleep stays poor, or you snore loudly or stop breathing at night, see your doctor.

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FAQs

Adults need at least seven hours. Needs differ, and the quality of your sleep matters as well as the length.

Yes. Night sweats and changing hormones disturb sleep for many women. Talk to your doctor if it is affecting your days.

References

  1. Centers for Disease Control and Prevention. How much sleep do I need?
  2. StatPearls. Physiology, Sleep Stages, ncbi.nlm.nih.gov/books/NBK526132.
  3. American Academy of Sleep Medicine, sleep stage descriptions, as summarised.

This article is for information. It is not medical advice. Speak to your doctor about your own health.