Running, Melatonin, and Serenil = Failure to Sleep

Alright, so I haven't found any research to confirm this, but I've noticed that when I'm more physically active I have a harder time falling asleep at night - thought it was supposed to be the opposite. After a run or workout, I take a hot shower and am usually ready to pass out. If I do fall asleep then, I only sleep for a couple hours and then I'm up and wired. If I stay awake and try to go to bed at a normal hour, my body feels restless and like I could literally go out and run a half marathon at 3 o'clock in the morning - and probably complete it in my best time. It's maddening!!!

I haven't been able to fall asleep before 5am for several weeks now. I've tried everything. Avoiding caffeine late in the day, avoiding the computer super late at night - not now obviously, trying to make the bedroom a peaceful retreat from the rest of the house, etc, etc. I've also tried melatonin and now have added serenil to the mix, which is a natural Italian sleep aid - though, it's not like melatonin that you take before bed, it's an herbal supplement that is supposed to help you relax and set your biorhythms straight. It's only been a few days since I've tried that and it's not working, either.

Oh, and when I do finally fall asleep and wake up the next day I feel EXHAUSTED and not fully rested at all.

Anyway, I really don't know how to fix this problem. How do you all eventually get to sleep? Any recommendations for your squad commander? Please help!!!