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What is pink noise, and can it help you sleep better? Here is what new research shows about deep sleep, REM, and the brain “detox” headlines.

Waking up at 3 AM every night can leave you tired and frustrated, but the timing is not always random. Learn why nighttime awakenings happen, what may be keeping you awake, practical ways to fall back asleep, and when recurring sleep disruptions should be discussed with a healthcare provider.

Biphasic sleep is an older sleep pattern where rest happens in two phases instead of one long stretch. Middle-of-the-night waking is not always insomnia, especially when the wakeful period feels calm instead of stressful.