Why do you feel groggy/like a hangover if you are awake for 2-3 hours then go back to sleep as opposed to just staying up?
Eg you sleep 10pm-2am then 5am-7am, waking up second time is like a hangover.
In: Biology
That second sleep session is too long to be a nap, and too short to go through an entire sleep cycle. You end up waking up in the middle of one, and being woken from the depths of a sleep cycle is when you have that “I’m not supposed to be awake”, groggy feeling.
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