Heh,

sleep deprivation is quite like LSD. Tiring, halucinatory and the effects wear off after a few days of healthy eating and sleep.*

The visuals in an LSD trip are more intersting by far though...

And, kids, remember that LSD is related to the ergot disasters of the middle ages.
http://www.chm.bris.ac.uk/motm/lsd/lsd1_text.htm

*) Unless you happen to go crazy of course.