Lucid dreaming 'cause you're half-asleep from sleep deprivation is pretty damned weird... Especially when you're doing tasks in the real world and you dream about them as you're doing them, so you can't tell the difference between what you've actually done and what you dreamed that you did...
It's somewhat un-nerving, but I've never let it get as bad as having outright hallucinations like some people I know have had. For example my late auntie once told me she hadn't slept for over 4 days during her Uni years and she started seeing wallpaper and carpet patterns swirl and move. That's one way of experiencing some sort of trip without doing any drugs, I guess. :P
As I said earlier last time this was discussed, I'm glad I've never experienced sleep paralysis. It sounds like it sucks. A lot. :S
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