Anyway, there was an interesting article in the Independent the other day with some interesting material on sleep.
"The biggest myths are that we need seven or eight hours a day, or that we shouldn't wake up in the night," continues Ramlakhan. "But waking early in the morning is perfectly normal. Students can still function well in an exam if they don't sleep the previous night. I sometimes professionally advise football players and I tell them not to worry about sleep before a big game. Even if they don't manage to sleep perfectly they will still perform well." So what's the key to an effective slumber? Ramlakhan explains the dos and don'ts of catching Z's