... You don't masturbate? How odd. If you find yourself unable to sleep, Mr Shintaro, then I would recommend doing so! In addition to the hormones released during orgasm functioning as aids for your sleep, studies done have also shown that masturbation increases one's self-esteem and the strength of one's immune system, and prevents cancer of the prostate -- ah, but I digress!

Is it that you're unaware of how? For men, the rudimentary movements are quite simple! Simply stroke your penis with your dominant hand until orgasm is reached.