Do You Need to Wash Your Sunscreen Off at Night?
Wash It Off
Even though your sunscreen is no longer effective, you should be sure to wash your face before going to sleep. While the actives in your sunscreen may be not-so-active anymore, there is probably sunscreen still left on your face. So at the end of the night, you do still need to wash your face.
Cleanse and Tone
Leftover sunscreen is not the only the only reason to wash your face at night. No matter what products you have used during the day, you should cleanse and tone your face to remove the dirt, debris, and oil (and makeup if you're wearing any) from your face. Not only will this help avoid clogged pores, but it will also prep your skin for your actives, such as glycolic acid. However, if you like the moisture you get from the combination moisturizer/ sunscreen product that you use in the morning, you can use also safely use it at night.
So while your sunscreen protection may only last a few hours, the residue, along with dirt and debris, needs to be removed at the end of the day.