When I was at Uni it was very random. Sometimes I'd pull all nighters, or I'd sleep from 4am till midday or something. Other days I'd be in bed really early around 7pm and then get up at 5am.

Now I'm working I tend to be a lot more fixed in pattern. I tend to go to bed between 11pm and 1am depending on how tired I am, and I usually get up at 5.30/6am, and then I'm in the office just before 8.

That way I have enough time to feed the cats, enjoy a proper straight razor shave, get dressed, get my stuff together and catch the Tube and still get to work on time.