Melatonin sits on the shelf of nearly every pharmacy, taken by millions of people hoping for an easier night's sleep. Its popularity has outpaced, in some ways, public understanding of what it actually does in the body.
What melatonin actually is
Melatonin is a hormone produced by the pineal gland, a small structure near the center of the brain. Its main physiological role isn't to sedate you — it's to signal timing, telling your body that it's dark and biological night has begun.
What the evidence supports
Research shows melatonin is most effective for shifting the timing of sleep — helping with jet lag, shift work, or a delayed sleep schedule — rather than for treating general insomnia in someone with a fairly normal sleep-wake rhythm.
Where the evidence is weaker
For people without a circadian timing issue, melatonin's effect on falling asleep faster or staying asleep longer is generally modest, and studies show wide individual variation in response.
A few practical notes
- Lower doses (0.5–1mg) taken a few hours before desired sleep time tend to be better aligned with how melatonin naturally works than the higher doses commonly sold
- Melatonin is a supplement, not tightly regulated for dosage accuracy — actual content can vary from what's on the label
- It can interact with certain medications, so it's worth checking with a doctor or pharmacist, especially if you take blood thinners or immunosuppressants
The bigger picture
Melatonin is a timing signal, not a sedative. For persistent sleep trouble unrelated to timing, addressing sleep hygiene, stress, or an underlying sleep disorder tends to matter more than the supplement itself.