I, like most people, only get about 4 or 5 hours of sleep a night. I think maybe four or five times in my life have I done the round the clock thing. There have also been near attempts.
All I know is that when I try (especially as I get older), as soon as I see the sun for the second time since sleeping last, I think, "GAWD am I tired". I get that deep down, semi-delusional, hullicinatory quasi living feeling that makes the whole concept not worth it.
Sleep - it does a body good.