PJ Problem

Alan likes to examine his private parts. I don't mind that within reason.
But he will do it at night when he's in bed. And if I don't put him in a one
piece PJ (I do run out of them from time to time) he ends up messing his diaper
up and leaking all over the sheet and PJ.
Last night he managed to do this even with a carters 2 piece pj with snaps :(

Any suggestions? I hate doing laundry as I have to pay per load in my condo
(and the washers shut off at 9:30 for some reason!)