This would have to be on the top of the list for one of the most common things I hear. Can you picture a whole day of pollution, makeup, dirt, oil production, sweat all sitting on the skin and going to bed with all this still on the skin surface? GROSS!! What a breeding ground for bacteria, blocked pores, dull skin to fester.
Solution
Cleanse your skin not only once, but twice every single night.
Cleansing twice will give the skin the best possible chance to stay bright and clean and let the night regime be able to do its job correctly. The first cleanse removes only the days build up and makeup, the second cleanse cleans the skin and pores efficiently