Personaly i have bad insomina and i have for years. if i get 5 hours of sleep im happy as hell about it and feel fine. Most of the time i get 3-4 hours and just feel kinda blah. then theres the times when i sleep 5-6 hours in 3-4 days and i feel like a zombie. so yeah you can get buy with 4.5 hours a sleep and feel fine but i know thanks to my wonderful sleep habits my immune system is a joke and i get sick all the time. I would never do it by choice. i would love to sleep 8 hours a night every night. So if you have the option dont try to get buy on less sleep.
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