Well said kevster.

I find the main problem is thinking about sleep, if you do that you're fucked! Masturbation is quite useless, unless I'm the only person on earth who needs a piss after a wank. But yeah, stop thinking about sleep, stop thinking about that you've got to be up at 7 the next morning, just take it as an oppurtunity to lie down and relax, and not care about anything.. if you fall asleep, yay, if you don't, who gives a shit.