You spend roughly a third of your life in bed, but you may be sharing it with more than you realize. While you sleep, sweat, body oils and dead skin cells accumulate on your sheets, providing food for dust mites and creating a warm environment where bacteria and fungi can thrive. Over time, that buildup may contribute to allergies, asthma symptoms, acne and skin irritation.
While there is no scientifically established perfect washing schedule, washing your sheets about once a week is a reasonable target, and going longer than two weeks may allow considerably more grime to accumulate.
Some people may need to wash them even more frequently, particularly if they experience night sweats, sleep with pets, have allergies or skin problems, sleep without clothing or regularly use lotions and hair products. Pillowcases may also benefit from being changed more frequently because of their direct contact with your face and hair.
Make washing your bedding part of your regular routine rather than waiting until it looks or smells dirty. Keeping sheets and pillowcases clean reduces the buildup of sweat, oils, skin cells and microorganisms you otherwise spend hours lying against every night. Your bed should be a place for restorative sleep, not an overlooked reservoir for everything your body leaves behind.
SOURCE:
Health, September 1, 2026