I tried running, but it didn't help at all. the only thing that has worked, so far, has been a strict meal/sleep schedule and melatonin.
Try the olympics lifts: power cleans and snatches and squat cleans and snatches. Or their components: deadlifts, front squats, presses. Or back squats and thrusters. Do a bunch of those in rapid succession and your whole body will be much more tired than doing a 5k run, guaranteed.
Check out Mark Rippetoe's "Starting Strength" [1] for more info. Great program for anyone new to weightlifting.