I must be both.
I have trouble sleeping, unless I'm really, really tired. It's rare that I'll sleep through the night since I'm such a light sleeper; any little thing will wake me up. I feel like I spend most of the night in a "half asleep" state where I'm too tired to get up and do anything, but a bit too awake to actually fall asleep. When I was younger, I pulled all nighters and got some of my best work done at 2 am. It's not quite that bad now, but still I average 5 hours of sleep per night. Unless I'm sick!
Some times I take melatonin, and that does help.
Tonight I tried to go to bed two times already, and I keep going back on the computer and logging on to Newgrounds.
Damn you Mr. Fulp!