The general recommendation is to wash bed sheets at least once every one to two weeks. Washing weekly is considered the gold standard to remove sweat, oils, allergens, and bacteria effectively. If there are allergies, asthma, night sweats, pets sharing the bed, or illness, washing more frequently, even two to three times per week, is advised. For those sleeping in full nightwear, showering before bed, or in cooler climates, washing every two weeks can be sufficient. Pillowcases might need more frequent changes if sheets are washed less often.
