It’s 3:47 in the morning. You’re lying in bed, staring at the ceiling, wide awake while your thoughts play in endless loops. There’s no sudden noise, no alarm clock, just you and your restless mind. For many people — especially older adults who notice their sleep becoming lighter with age — these mysterious early wake-ups are a frustrating routine.
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But neuroscientists say they’re not random. Waking up between 3 and 5
