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.
I’m more interested why sleeping 12 hours feels like I didn’t sleep at all and taking that 1-2hr nap after sleeping that long wakes you up.
You are entering full sleep cycles but interrupting them.
Throughout the night you need to move between light, REM, and deep sleep in a particular pattern (unique to you). This process is failing to complete.
Some people can reset a sleep cycle over and over again and ride that sleepy feeling constantly. Depressed people often use this a comforting place to hide from the world.
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