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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
about 182 days.
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.
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
Not from going without sleep. The alcohol will eventually kill you, though.