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Why do I wake up faster when I go to sleep super tired?

So I could spend time trying to go to sleep and then sleep for 10 hours. But if I do something relatively less usual, like getting up at 5:30am and going to bed at 10:30pm (I am super tired and fall asleep in seconds) I usually wake up in about 5 hours excited and ready to get up if I don't force myself to go back to sleep.

So the question is; why is it when im super tired I wake up much earlier and much more energetic than usual?

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