Insomnia is a pain in the ass. Sometimes you can't fall asleep. Sometimes you can't stay asleep. It keeps you up when it shouldn't. Ever tried to go to work on literally no sleep and pull an excessively long day? Ever come home that very night and been unable to fall asleep or stay asleep? Yeah, it sucks.
I must have taken three naps yesterday, each one a few hours, and then finally fell asleep this AM, but slept all damn day because I was too tired to wake up. No, there are no outside factors, aside from a demon infested household according to Grey Wolf, my fully Caucasian Native American shaman. Below is a scientific chart.
