It's always taken me ages to get to sleep. When I was 12-13 or so, and had a 10pm bedtime, I'd see 2am, sometimes even 3am on the clock before I got to sleep. Every night.
Ended up going to see the doctor about it, but they couldn't really do much without sleeping pills which he didn't want to do at that age.
Nowadays it's not too bad because I go to bed later, I've given up having a clock in the room (ticking clocks annoy me, and I clock-watch if I have an LED clock), but it takes a good couple of hours for me to doze off every night. Very annoying if it's midnight, I have to be up at 6:30am for work, and I know that I'm not going to get any more than 3 or 4 hours sleep tops. No matter what time I go to bed, I'm never asleep before 2am.