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In clinical settings people experienced hallucinations with less than 48 hours of sleep deprivation.

http://www.amsciepub.com/doi/abs/10.2466/pms.1989.68.3.787?j...

I have no idea where you get 7 days from, I'm not sure its possible to stay awake for 7 days.

On reflection, maybe I got confused with the number of days you can go without water (also 7, at least according to my memory). I stayed awake for 5 days once and there was only a bare minimum of hallucination at the end. I could have stayed awake longer, it wasn't really hard by that point. The people I've known who stayed up forever on crystal meth typically started hallucinating after a week. I'm surprised that the limit is so much shorter, but I'll believe it, thanks for the link.

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