i was like this, especially in grad school. i worked late (till 2am or so) and would often stay up to see the sun rise, then sleep well past noon the next day. it was debilitating.
then as soon as i hit 30, i lost the ability to sleep in. now, i literally wake up at 6:00 every morning, no matter when i go to bet. even on weekends. it's insane.
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