I've found recently that at crunch time on uni work/ freelance work I seem to just omit the having a life part of my day to maintain a similar amount of sleep.
Also the sleep moves from say midnight -1 to 10-11 to about 5-6 to 12-2
Also the sleep moves from say midnight -1 to 10-11 to about 5-6 to 12-2
And I need 8-9 hours of sleep, anything below that and my productivity drops like a stone.