From my understanding it's all about getting into a good rhythm. If you sleep for 5 hours or whatever every single night it's fine, but if you're all over the place it's terrible for you, even if you're getting over 5 hours every night. Something about timing the biorhythms or something... Anyways I'll stop there as I don't want to sound like an idiot.
And of course alot depends on the person as well. I took PSYC back in first year and we learned about this one woman who slept something crazy like a couple hours a week or something, yet was perfectly healthy. Can't remember the name of the disorder. Obviously very rare though.
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