Medical and cleaning experts generally recommend washing bed sheets about once a week to maintain cleanliness and a healthy sleep environment

. This weekly schedule helps remove accumulated sweat, body oils, dead skin cells, bacteria, dust mites, and allergens that build up over time and can affect skin health and respiratory conditions

. If you use a top sheet, some sources say you might extend washing to every two weeks, but weekly washing is still preferred for hygiene

. People who sweat a lot at night, have allergies, asthma, sensitive skin, pets sleeping in the bed, or are ill should wash their sheets more frequently, possibly every three to four days or at least weekly

. Pillowcases should be washed even more often, at least once a week, since they accumulate oils, sweat, and bacteria from your face and hair

. In summary:

• Standard recommendation: Wash sheets once a week.
• If using a top sheet: Washing every two weeks might be acceptable.
• More frequent washing: For hot sleepers, allergy sufferers, pet owners, or illness, wash more often (every 3-4 days).
• Pillowcases: Change at least weekly.

This routine helps ensure a clean, comfortable, and healthy sleeping environment