Practice getting off the Internet and going to bed:
Starting while not absorbed in browsing the web, find some not-too-compelling website, browse for a few minutes (not enough to get really into it) and then go and lie in bed for a few minutes (which shouldn't feel as difficult as it's not committing to a full night's sleep). While in bed, let your mind wander away from the internet. This practice can lead into practice for getting out of bed.
I tried this a bit - I'm not sure it was worthwhile, as I did sometimes get absorbed in browsing when trying this exercise.
Thus spake Eliezer:
It seems that many here might have outlandish ideas for ways of improving our lives. For instance, a recent post advocated installing really bright lights as a way to boost alertness and productivity. We should not adopt such hacks into our dogma until we're pretty sure they work; however, one way of knowing whether a crazy idea works is to try implementing it, and you may have more ideas than you're planning to implement.
So: please post all such lifehack ideas! Even if you haven't tried them, even if they seem unlikely to work. Post them separately, unless some other way would be more appropriate. If you've tried some idea and it hasn't worked, it would be useful to post that too.