Lately I've been going to bed at around 2am... Mainly due to uni and the insane amount of study we're needing to do at the moment.
I used to go to bed at ~10pm, but then would find that it would take me ~3hours to get to sleep anyway... So I slowly started using those 3hrs do something productive rather than stare at the ceiling waiting for sleep to come. Now it usually only takes me 30mins to 1hr to get to sleep cos I completely drain my body
I find I can get by on ~5hrs sleep per night, although ideally I try to get 7-8hrs sleep per night (10hrs sleep on weekends ^___^ <3 weekends ^__^ )
Jam it back in, in the dark.