 Nearly 50% of single men said that they didn't wash their sheets for up to four months according to a study. But about 62% of single women remember to clean their sheets every two weeks. Come on dudes. Really? Experts recommend washing your sheets once a week including your duvet cover at least once a month. That's because you shed skin cells when you're asleep and that's what dust might see for dinner. They can trigger allergies and asthma and cause skin irritation. Your sheets collect a lot of other nastiness like sweat, germs, and even poop. And if your pet sleeps with you in bed, you'll probably have their hair and dander all over your sheets. So you might want to wash them a little bit more often or right now.