For about a month now i have had some trouble getting full erections even when i masturbate. I can get it hard, but it seems i have to put more work into it, and once it is fully erect i seems to go semi-erect fairly fast. I don't get erections as easy as I used to. I used to just think about sex and i would get a full erection. I'm 22, i eat healthy, could probably do more exercise, I've just had a 3 month vacation, where i mostly just sat on my ass, so could that be the problem, lack of exercise? I take no medication, and i have no mental issues. I have had some trouble sleeping, could that also affect it? I haven't experienced a full morning erection for a while either, if i do, it's only a semi-erect one. Anyone had the same problem? Hope you can help a worried fella!