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
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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