Melatonin — What It Actually Does and What It Does Not

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Melatonin is the most-misunderstood sleep supplement. Here is what it actually does.

What melatonin DOES

  • Helps shift circadian rhythm (jet lag, shift work).
  • Helps fall asleep when you’re not ready for sleep.
  • Mild sedation effect.

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What melatonin DOES NOT do

  • Make you sleep deeper or longer.
  • Treat insomnia long-term.
  • Replace good sleep hygiene.

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The right dose

0.5-3mg. NOT 5-10mg (most over-the-counter doses are too high). Higher doses disrupt natural production.

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When to take it

30-60 minutes before desired bedtime. Use 3-5 days only for jet lag, then stop.

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Long-term use

Avoid daily melatonin use. Tolerance develops. Natural production may decrease.

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Better than melatonin for chronic insomnia

  • CBT-I (free apps available).
  • Sleep hygiene improvements.
  • Magnesium glycinate.
  • Bedroom environment optimization.

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Habits that actually improve sleep

Whatever the specific issue, a handful of evidence-based habits do most of the heavy lifting for better sleep. Build these in first:

  • Keep a consistent schedule — go to bed and wake up at about the same time every day, weekends included. A steady rhythm is one of the strongest drivers of good sleep.
  • Cool, dark, quiet room — a bedroom around 65°F (18°C), with light and noise minimized, helps your body settle.
  • Watch caffeine timing — caffeine can linger for many hours, so cutting it off by early afternoon protects your night.
  • Wind down without screens — dim the lights and step away from bright phone and TV screens for 30–60 minutes before bed.
  • Get morning daylight and move your body — natural light early and regular exercise (not right before bed) both strengthen your sleep drive.

When to talk to a professional

Occasional rough nights are normal. But if sleep problems last for several weeks, leave you exhausted during the day, or come with loud snoring and gasping (a possible sign of sleep apnea), it is worth speaking with a doctor. Persistent insomnia and sleep disorders are treatable, and you do not have to just live with them.

Frequently asked questions

How much sleep do adults actually need? Most adults do best with about 7 to 9 hours a night. The right number within that range is the amount that leaves you rested and alert the next day.

What should I do if I can’t fall asleep? If you have been lying awake for around 20 minutes, get up and do something calm and low-light — read a little, stretch — then return to bed when you feel sleepy. Staring at the clock tends to make it worse.

Do naps help or hurt? A short nap of 10–20 minutes in the early afternoon can boost alertness. Long or late-day naps, though, can make it harder to fall asleep at night.

Verdict

Melatonin works for jet lag and circadian shifts at 0.5-3mg. Skip it for chronic insomnia — CBT-I and sleep hygiene work better.

Reminder: General guidance only.


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