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By 3am you’ve had most of your deep sleep, so it takes less to wake you. Here’s what turns a brief waking into an hour awake, and how to get back to sleep.

Partly true. A 2025 survey of 1,082 students linked worse nightmares to lactose intolerance and late eating. Cheese itself has never had a fair test.

Your body clock shifts about an hour a day after a long flight. Light timing, a head start before you leave and well-timed melatonin can speed it up.

Every one to two years is the usual advice, but no study set that number. What actually wears out, how long each fill lasts and the signs to watch for.

About three in 10 US adults have tried a “sleep divorce.” What the research says about sleeping apart, and how couples who do it stay close.