Sunrise alarms: faking the dawn in winter

Morning light is the main signal that keeps your body clock on time. On dark winter mornings there isn't any, and many people drift later. A sunrise alarm brightens the room gradually before your alarm goes off.

What matters: how bright it gets, how gradual the fade is, and whether the light faces you. What doesn't: radios, apps and 20 sound options. Pair it with: the same wake time every day, and daylight outside once it's up.

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