Melatonin is a hormone naturally produced by the pineal gland in your brain that helps regulate your sleep-wake cycle (circadian rhythm). According to research, melatonin levels typically rise in the evening and fall in the morning, signaling to your body when it’s time to sleep and wake up.
The hormone works by:
- Binding to receptors in the brain that reduce nerve activity
- Decreasing dopamine levels that help you stay awake
- Regulating your body temperature for optimal sleep
As a supplement, synthetic melatonin mimics this natural process, which is why it’s commonly used to treat sleep disorders and jet lag.
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Last Updated: October 9, 2025
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