I took nyquil to get to sleep last night, since I was still buzzed on caffeine, and I slept very solidly - though I still woke up at 5, I fell back asleep almost immediately. I could still fall asleep easily right now, in fact.
I must have slept in a strange position, because something in my shoulder joint isn't where it's supposed to be - lifting my mousing arm is quite painful. I don't think I injured it at the gym, since I wasn't doing any upper body lifting last night. Sleeping, it seems, is not without its own dangers.
This does not seem to be my week.