It can sometimes take me a while to get to sleep, but when I do I am usually ok. If I wake during the night, which I sometimes do many times, I can get back off quick enough. I usually aim to get between 5-7 hours sleep a night, more generally on weekends due to having a lie in until mid afternoon. I have always been 'a night person' (no, not a vampire :P) so don't like to go to bed early, very rarely this year have I been in bed by midnight. Even if I have to be up at 7am it can be 1am before I'm in bed. From what I heard though (on QI :P) it is more healthy for you to get between 4-7 hours of sleep, rather than 8 as many people think.