If you take some kind of medication to help you sleep, it could help you to develop a routine if you know about how long it takes for the medicine to kick in.

I also take sleep aids. It's just over the counter diphenhydramine. It takes about 90 minutes to kick in (depending on how alert I am when I actually take it). So I tend to start my homework earlier, and leave the more mindless activities for later in the evening. I usually will brush my teeth, shower, etc right after I take the pills. So generally I have done the hygiene stuff, then I just relax, go over notes, write out flash cards, or will read (text or novel) until I can't stay awake any longer. So you might want to use the time between when you take the pills and when you usually fall asleep to do your routine. Try to keep it pretty low-key