During the come-up on 1p-LSD, I've found that I get very lethargic and have to lie down; almost to the point of falling asleep. Mind you, this has only been twice that I've tried this compound, and at low levels (25 ug and 75 ug). Sleep came 'fitfully after 9 hours.
Sleep was accomplished easily on LSZ @ 75, 150 and 225 ug after 7 hours or so.
Tom
[edit; I've tried lysergamides so little that I can't really say what my typical reaction is, but when I tried 1p-LSD @ 75 ug, the all consuming tiredness felt at the beginning was rather like what a mushroom trip does to me - and that always makes me sleepy]