Not everyone can turn off the lights, snuggle up in bed, and drift off to restful sleep within a few minutes. Some of us lay awake tossing and turning — counting sheep, focusing on our breath, and trying to empty our minds from the woes of today and the anxieties of tomorrow. Melatonin is the hormone that regulates your sleep-wake cycle and keeps your circadian rhythm in check, per Sleep Foundation. Interestingly, melatonin can be produced inside your body (endogenous melatonin) and introduced from outside your body too (exogenous melatonin).
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Saturday, October 4, 2025