Why do i get an erection just for laying in bed when i am about to sleep even though i have no sexual desiers?

Body's horny, UR not: This is not at all abnormal or uncommon. Sometimes it is simply a case of a high physical libido without the psychological libido.. You may be too tired or not in the mood, but mr everready stands at attention. I suspect it happens to most if not all men at some point. As you age it can reverse, so enjoy it while you've got it.