Most of my friends say passed out sleep sucks. I concur--it goes really fast and I feel like dying when waking up with a hangover. From my summer psychology class when we learned of sleep cycles my prof said being passed out is not sleeping. It's....being passed out? And like when one has cleared alcohol form their system they start the sleep system all over again.
So say you have four shots, so it takes 6 hours (+- depending on variety of things, genetics, the drinks, etc.) to clear your system. The rest of your sleep is now starting over from stage 1 so when you wake up at like 9 hours of total "sleep" you actually wake up in REM or stage 4 and you feel shitty. That's how I understand it.
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