To say it happens like clockwork is an understatement-it is clockwork, literally: Every night, or more accurately, early ...

Sleep experts reveal why going to bed after a certain time disrupts cortisol and melatonin balance, causing disrupted sleep.

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Continuous sleep is a modern habit, not an evolutionary constant, which helps explain why many of us still wake at 3am and wonder if something’s wrong. It might help to know that this is a deeply ...