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.