Changing your pillowcase is a good suggestion, but every single night is a bit extreme. Maybe twice a week? Also, make sure every bit of your makeup is off at night. It'll clog your pores and cause acne. Don't overwash your face either! It'll make it dry. Washing your face with a gentle anti-acne facial cleanser once a day is optimal. Burt's Bees Chamomile and Soap Bark Deep Facial Cleansing Cream works miracles, and smells fantastic.
If its a sunny day, and you're sweating with makeup on, put some skin toner in a spray bottle and occasionally spritz it on your face. Burt's Bees Rosewater toner works for me and is super refreshing. Its all just about keeping clean- you face, and your skin products!