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10 days.
8 days
World records for days without sleep have surpassed 10 days. Theoretically, one does not need sleep, but will function less effectively without the "recharge" it provides to the body and mind.
He sleeps at night
so far a friend of mine manage to still function after 3 days of no sleep
The longest that a human has stayed awake is just short of 11 days, so theoretically staying awake for eight days is doable. However it is not healthy and you should not attempt it.
well a person can only stay up about 2 days without sleep so 4 shifts
It all depends on the person. In the military you develop capacity to withstand long hours without sleep. 20 years ago I could go without sleep for 6 days before hallucinations. now 2 days is enough for me to hallucinate lacking sleep. This means the capacitiy is reduced with age.
about 182 days.
People can only go without sleep for about two days. Then they just have to fall asleep. Ive stayed up 4 days straight.
It depends on the persons body and how it reacts to the loss of sleep
It is perfectly fine to go eight hours without eating. In fact, researchers are finding evidence that the human body works at maximum efficiencywhen one only eats 5 days a week. Humans are able to live three weeks without eating. Also, don't you sleep for eight hours, generally? You don't eat when you sleep, do you?...