Four nights in a row. I can barely keep my eyes open, I can't concentrate, I have that nasty, heavy feeling in your chest when you haven't had a good night's sleep. I can't take a nap, I can never fall asleep during the day no matter how tired I am. For no discernible reason at all, this randomly pops up when I haven't had to deal with it for many months, maybe over a year. I get enough fresh air everyday, I exercise, I eat healthy, what the hell?