I've gotten close to falling asleep playing a few video games (FFXII and Disgaea 2 are so monotonous I'll get tired), but I don't just randomly fall asleep. I'll notice I'm nodding off and then decide to nap.
Nah, I'd rather be tired than have a headache. Headaches suck. :p
I almost napped today, but I didn't. I have to get up at 6:30am all week, except Saturday, when I have to get up at 5:30... :( I have to get to bed early. If I napped I'd go to bed at midnight at least.