Hmm. When I was in the Peace Corps, I literally did not sleep a wink for the entire first month of training. That's right -- I had no sleep whatsoever for an entire month. I think that the anti-malarial medication might be partly responsible, but it might have been the stress, since my first sleepless night was the very last night I spent at home before leaving.
But during the day I was totally functional. The only symptoms I noticed was my temper was a bit shorter (but not much), and feeling kind of stressed and down. But it's hard to say what was cause and what was effect.
Actually, if their god makes better pancakes, I'm totally switching sides. --
Charley the Australopithecine