I am the same EXACT way. The self-discipline is the hardest thing for me to go to bed on time. But the medication I am on, just knocks me out.

However, when trying to get to sleep, if there are any noises outside (my neighbor used to have an air conditioner that had a weird beep every 10 seconds that used to drive me nute!!), I have a hard time falling asleep.

Maybe try the melatonin like someone else suggested, it can be really helpful.