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My sleep cycle naturally drifts infinitely by some 30 minutes a day on average.

It makes life strange at times, especially on this latitude. Imagine waking up at night through a whole winter, not seeing the Sun for months.

I've tried to hold steady cycle but I just grow more and more tired every day until finally the alarm fails to wake me. School was hell. Was absent a lot simply for sleeping.

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I was exactly the same, a lot of reading about sleep and strict sleep hygiene fixed it. There are lots you can do but briefly just go out for a jog when you wake up. You need the exposure to blue light to help set your circadian rhythm. The exercise increases body temp which helps bring forward your circadian rhythm. Basically your habits are probably shifting your circadian rhythm back 30min a day, and if not you can have habits which bring forward your circadian rythm

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