First of all, make up is notorious for clogging pores, and I personally never not washed it off for this reason alone, even when its 3 am and I'm drunk as hell and feel ill after a night out, cause I don't want to wake up with the spots all over my face. Secondly, the aging process can speed up due to makeup, your skin is going through a recovery process at night, and make up slows down that process meaning you can experience premature aging
Thirdly, there's risk of eye infections and eye irritation due to all that mascara and eye shadow. So in conclusion I really think its keeping you from having the best possible skin. Unfortunately many people that don't experience any immidiate symptoms like spots are notorious for leaving make up on and it happens way more often than this community is letting onπ All I can do is apologise for all the *gasps* you about to get/got