I was a latchkey kid who trained coder, sleep for me, was plentiful but it was useless to me. I can confirm the hallucinations start around day 2, more like wobblies than full on halluc, trippiness. Thats when you feel very tried and really need sleep. Sober, I've stayed awake more than 72 hours, but not for a long time. I used to be able to pull a "double-day", where I just stayed up, went to work again, and didnt sleep until the 2nd night. I cant do that anymore, which I attribute to age. Probably for the best. I sleep everynight now. On meth, during the 1 year that I was doing it, and never did it again btw.... I stayed awake over 4 days, and I am pretty sure I slept for at least 2 when I finally came down. All that on NO FOOD. Meth is bad for you, dont try it. Its super fun, but it tears you apart. I got lucky, most do not return. The best sleep, like ardvarcus has said, is after hard labor work. Happy, contented sleep. Chop down some trees, build a shed, you'll feel better tmw.