Blimey - I think I stopped going to bed before 22:30 when I was 12 or 13 and by 16 or 17 it was usually around midnight. On nights out after the age of 18 it would be later, say 02:00 - 04:00, which is where it is now since I no longer have to get up early to go to work.
It felt really odd when I spent 9 days in hospital in 2012 to have the lights turned out at about 22:00. I did manage to get to sleep after an hour or two, but there was so much going on in the wards and corridors that I would be woken up a couple of times an hour.