[man]

yeah I've had this trouble before, earlier this fall, but I've also had mild sleep issues in general anyway. I'd go to sleep at 1, wake up at 5, lie in bed for a few hours, eventually go back to sleep. this was also when I was running 50 miles a week. in general I think this happens when you're stressed out. exercise might help, even though it didn't happen in my case. you could try to get medication, but it can make you just as groggy. generally I wouldn't worry about it too much, because you won't get to sleep if you try too hard.