You might as well just take a bunch of Benadryl. You get the same sleep depravation high, and you wait for the benadryl to kick in, then drink a buncha coffee or some shit to keep you awake. It's a kinda crappy high, but sometimes it's kinda cool too. Always have hallucinations when I do it. Auditory and visual. Hearing random bells and chimes off in the distance w/ people saying my name, to seeing a bunch of scorpions on my floor.
Btw @ OP: You claim this is "w/o drugs" but you say you take caffeine. Caffeine is a drug ya mook.