I need some help trying to figure out why I'm so tired. It might sound stupid but wonder if it's because on somedays I masterbate reasonably "excesivly"... 5 or 6 times... ; my diet (coke and chocolate) or work stress? If I stop moving, I could fall asleep... and easily sleep for 4 hours during the day! Any ideas?

Your diet is chocolate and coke? Yeah, that could cause it... so could high blood pressure and a number of other ailments, but not masturbation.

Time to visit your doctor.