Lately I've had the lovely ability to sleep in til 9 or 10am thanks to working in the evening and not having classes. But today my internal clock decided to screw with me. I woke up at 6am on the dot (checked my cell phone) and now I can't sleep again. This has happened before but it's always random when I wake up early. Sometimes I wake up 15 minutes before my alarm, other times I wake up an hour or two ahead of time. And this isn't the kind of waking where I'm grogy and half-asleep, I go from dead sleep to fully awake and I usually can't force myself to fall asleep again. I got used to it happening in high school when I'd wake up 15 minutes before my alarm. I figured after waking up at the same time for months I finally just got tired of hearing the stupid thing. Does this ever happen to anyone else?