Hello, Random Insomnia

The extent of insomnia I've experienced up until now is waking up several times in the middle of the night. Last night was a huge exception, and I can't really explain it. I just remember being so awake that I could literally stay up forever (and I did). I couldn't understand why I wasn't tired, but wired. Maybe it was because I read some creepy shit about stupid spiders last night on reddit (search: goodbye sleep) and felt all crawly afterwards. Anyway, the whole thing was frustrating and I didn't fall asleep until after Greg's school alarm went off at 7am this morning . . . what's worse is that I only got three hours of sleep and that was it. Not being able to sleep is rare for me. I wonder what's got me?