How many days can you go without sleep before you die?

I'm curious. A few summers ago, I've stayed awake for 4 1/2 days, went to sleep for a day, stayed up for 3 more days and have continued on in that fashion for a while. I've heard that two days without sleep can mess with your head. How many days does it take to kill you? What can my said sleeping... show more I'm curious. A few summers ago, I've stayed awake for 4 1/2 days, went to sleep for a day, stayed up for 3 more days and have continued on in that fashion for a while. I've heard that two days without sleep can mess with your head. How many days does it take to kill you? What can my said sleeping pattern do to me?
Update: Just a note: I had to google Pandora's answer.
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