 Am I the only one who didn't know I had to wash my pillow? Apparently if you've been using the same pillow for two years, a third of its weight is now dead skin, dust mites, and their poop. And breathing that in night after night could affect your sleep quality and make your allergies worse. All pillows are different, so make sure you check washing instructions before just checking it into the machine. And yes, you should also be washing your mattress, but we've already made a video about that.