you are sick, have irritated skin, or share the bed with a pet.
Pets bring in dirt, dander, and outdoor debris, and they can leave hair on the bedding. If your dog or cat sleeps with you, consider washing your sheets weekly—or more often if they become visibly dirty or develop an odor. A washable blanket placed over the bed can also help protect the sheets between laundry days.
If you have a respiratory illness or another infection, fresh bedding can make your bed feel more comfortable while you recover.
