Between 9 and 11PM, I shut off my laptop, don my robe, light scented candles, and draw a bath. Exactly like that, every single time.

Glad it works for you, but I don't have 2 hours a night that I can spend not doing anything.

Then again, I don't have a huge amount of difficulty regulating my sleep schedule. It takes me a long time to fall asleep (I would say 45 minutes on average) but it always has and it doesn't stress me out–it's awfully comfy lying in bed. I tend to get tired fairly early–in fact, I'm often pretty tired all the time, because my schedule is insane, thus the lack of 2 hours a day for bedtime rituals.

Every once in a while I'll pass my bedtime while engaged in a superstimulus, like reading a good book, but most of the time I look at when I have to wake up, count back eight to nine hours, and put myself to bed at that time. If not a ritual, this is definitely a strongly reinforced habit–it doesn't take much willpower to get myself off my laptop 10 minutes before bedtime, because I know full well how good being in bed will feel, and how I'll feel the next day if I don't go to bed on time.