i've (accidentally) done it many times..
i've slept in my face makeup- foundation, powder, etc.

Answer:
Sleeping in your makeup does not directly speed up wrinkles or aging, no, but it's very bad for your skin. It clogs your pores and gives all the chemicals ample time to seep into your skin– that part, the chemicals part, is what will lead to early signs of aging skin. Sleep is when your body does a lot of hard work to maintain itself, so giving your face some space to breathe after lots of makeup is a much superior idea than going to sleep in it and letting it rub all over your pillow and give you raccoon eyes the next morning!

An simple solution is to keep a package of makeup wipes (Almay makes good oil-free ones) by your bed and just wipe everything off with the cloth before you go to sleep.

Answer:
Hai dear,
Nature is always protective and harmless but to highlight ourself we get the assistance of make up. It not wrong to do make which is opt to our skin tone but it is very much harmful to let the make up in our skin for a long. so it is advisable to remove all the make up with quality cleanser and apply moisturizer before u sleep to keep ur skin young and healthy.
Answer:
I'm not sure, but it's bad for you're pores and skin, because you're skin needs to breathe. This can cause problems like oily skin, breakouts, acne, or even dry skin if you do it too often.
Answer:
I don't think so, but I know sleeping with make up causes blemishes, chapped lips, dry skin, clogged pores, and a dull complexion.
Answer:
Yes. You might not see it now, but when you get older, you’ll notice your skin might not be as tight, more wrinkly, and also saggy.
Answer:
no but it makes your skin look like crap. It'll clog your pours and cause you to break out and develop blackheads.
Answer:
It is so bad for your pores.