I got excited because I thought this was about the Strokes song.
Anyway, no 'fear' of sleep, but I do have some crazy insomnia problems. It comes in streaks, and during a streak of it I typically never go to sleep if I haven't been awake for at least 24 hours. And after about 30-35 hours, you get this weird energy boost where you're actually wide awake, and can end up being awake for way longer. I hit 50+ hours sometimes, that's where you start to get scary out of it. Like small hallucinations, reaction time is shot, and really weird thoughts and ideas start rushing in.
That's weird, though, I can't imagine actually being afraid of going to sleep. I just simply can't do it.