Mostly the internet.
I've now been awake for 26 hours, 18 of them spent doing hard physical labour on a movie set, 6 more dancing and drinking with friends. This is the sixth day in a row I've been doing this. I've slept a total of 10 hours the past week. I could not be more tired. But there's always just one more interesting thread to read somewhere out there, or a news article, or a movie or game review, or a podcast, or a funny video (Or porn).
Sleeping is overrated anyway. I can't enjoy sleeping because I'm asleep while it's happening, sure, laying down in bed dead tired and closing your eyes feels good, but it's over in 5 minutes. always bothered me, that.