my experience was from '70, '71. lack of sleep was very detrimental, I know at one point I was running on 2 hours of sleep for 3 days. we cleaned the frat house top to bottom, went to class, had line-ups at nite(hours of push ups, sit ups with someone yelling in your face). the worst was eating dinner out of a real garbage can, scraps, potato peals, hunks of butter, etc more than one of my brothers puked their guts out. the penalty? more push ups. when we got done with hell week, I told everybody to fuck off, drank a couple beers and passed out for 2 days.