Short answer
How often should you wash your sheets and pillowcases?
Once a week for most people; if you don’t sleep in the bed every night, every two weeks is the outer limit. Wash more often if a pet shares the bed — the Sleep Foundation suggests every 3–4 days — and if you’re allergic to dust mites, use hot water: allergy groups recommend at least 130°F (54°C).
Typical intervalWeekly · every 2 weeks at most
Sheets and pillowcases: weekly, two weeks at most
Wash sheets and pillowcases once a week. That’s the Sleep Foundation’s recommendation for most people, and Cleveland Clinic’s advice says the same — at least weekly, with a dermatologist suggesting fresh sheets every one to two weeks. If you don’t sleep in the bed every night, the Sleep Foundation says you can stretch it to about every two weeks.
The reason is everything a bed collects overnight: sweat, body oils, dead skin cells, and the dust mites that feed on them, along with their droppings. Pillowcases sit against your face and hair all night, so even if the sheets wait a few extra days, change the pillowcases weekly.
These intervals are common advice from doctors and sleep-health writers rather than numbers from hard studies. Aim for weekly and treat two weeks as the ceiling, and you’re in line with all of them.
When to wash more often
Shorten the interval if any of these apply. The Sleep Foundation and Cleveland Clinic both list them:
- A pet sleeps on the bed. The Sleep Foundation suggests washing every 3–4 days. If it’s the dog, keeping up with dog baths helps too.
- You have allergies or asthma. Washing more often reduces allergens in the bedding.
- You sweat a lot, or it’s hot and humid. Sweat builds up faster in summer.
- You’ve been sick, eat in bed, or sleep naked.
Humidity matters for dust mites. The AAFA recommends keeping indoor humidity between 30 and 50%; if you run a dehumidifier in the bedroom to get there, keep its filter clean as well.
Duvets, comforters and pillows
The rest of the bed doesn’t need weekly washing, but it does need washing:
| Item | How often | Source |
|---|---|---|
| Sheets, pillowcases | Weekly, every 2 weeks at most | Sleep Foundation, Cleveland Clinic |
| Duvet cover | Every 2 weeks to a month | Sleep Foundation |
| Comforter, blankets | Every 2–3 months; some doctors say about every 6 months or as needed | Sleep Foundation, Cleveland Clinic |
| Washable pillows | Every 4–6 months | Sleep Foundation |
Pillows that can’t go in the machine whole, like memory foam or latex, and dry-clean-only comforters should follow the care label. For dust mite allergies, the AAAAI also suggests encasing pillows and mattresses in dust-mite-proof covers.
Water temperature: label first, hot for dust mites
For everyday washing, use the hottest water the care label allows. The Sleep Foundation notes that warm and hot water help kill dust mites and germs; cotton generally handles hot water, while polyester and other synthetics do better on warm.
If you’re allergic to dust mites, go hotter. The AAAAI says to wash sheets, pillowcases and blankets weekly in 130°F water (about 54°C), and the AAFA gives the same minimum for sheets and blankets. Not every machine heats water that far, so check your washer’s manual for what its hot or sanitize setting actually reaches.
Dry everything promptly. The Sleep Foundation recommends moving sheets to the dryer or a clothesline right after the cycle ends, since sheets left sitting wet can develop mildew and odor.
When to replace pillows and sheets
Replace pillows about every 1–2 years. The Sleep Foundation says that’s what most experts recommend, though material makes a big difference: memory foam lasts about 2–3 years, latex 2–4 years and polyester as little as 6 months to 2 years. A pillow that sags, stays lumpy, turns noticeably yellow or leaves you with a sore neck is due; a down or feather pillow that doesn’t spring back after you fold it in half is too. Pillowcases are worth replacing every 1–2 years.
Sheets don’t have an agreed lifespan, so go by condition: pilling, thin patches, tears, faded fabric, elastic that no longer grips the mattress, or a smell that survives the wash. Owning two sets and rotating them also means you never have to wait for one to dry.
Common mistakes
- Washing sheets but never the comforter or pillows. The cover protects them only so much; they need their own schedule.
- Leaving clean sheets in the machine. Damp bedding left in the drum can turn musty before it ever reaches the bed.
- Blaming the sheets for a musty smell when the washer itself needs a clean — see how often to clean a washing machine.
- Ignoring the care label for the sake of hotter water and ending up with shrunken or warped sheets.
- Changing pillowcases less often than sheets. They’re the part closest to your face.
How to remember
Pick one day of the week for the sheets — say, Saturday morning, straight from the bed into the washer — and it becomes a habit. What actually slips is the comforter and pillows every few months, and in a shared bedroom, the question of whether anyone changed the sheets this week.
Track “change sheets + pillowcases” as a weekly item, and give the comforter and pillows their own longer intervals. Other bedroom upkeep, like the air purifier filter, fits in the same list.
Keep track of it with Againday
Sheets have no built-in due date, so one week easily turns into three — and when two people share the bed and the chore, neither is sure who changed them last.
- Add a new item called “Change sheets + pillowcases” and set How Often to “Weekly”.
- Give it the tag “Home” so you can filter it with related items.
- Set its reminder time to 9:00 AM. You’ll get one notification on the day it’s due.
- Put it in a shared list such as “Home”. Whoever does it marks it done, and everyone sees who did it.
- When it’s done, tap the cycle ring to mark it done. Forgot to log it? Add a past date from the item’s page.
- Add a note to each entry, for example: “Washed the duvet cover too”.
Againday is free for 3 items, with shared lists, widgets and reminders included. Againday Pro is one purchase, not a subscription.
Frequently asked questions
- Do sheets need to be washed in hot water?
- Not for routine washing — the Sleep Foundation says to use the hottest water the care label allows. Hot water matters more if you’re allergic to dust mites; the American Academy of Allergy, Asthma & Immunology (AAAAI) and the Asthma and Allergy Foundation of America both say to wash bedding weekly in water of at least 130°F (about 54°C). Check the label first, since delicate fabrics and many synthetics are better washed warm.
- How often should you wash a comforter or duvet?
- Much less often than sheets. The Sleep Foundation suggests washing comforters and blankets every 2–3 months and duvet covers every 2 weeks to a month; a Cleveland Clinic dermatologist says comforters and pillows can go about six months, or until they need it. For dust mite allergies, the AAAAI’s advice is to remove, wash or cover comforters.
- Is it okay to wash sheets every two weeks?
- Sometimes, but treat two weeks as the limit. The Sleep Foundation says people who don’t sleep on the mattress every night can stretch to about every two weeks. If a pet shares the bed, you sweat a lot, you have allergies or asthma, or you’ve been sick, stick to weekly or more often.
- How often should you replace pillows and sheets?
- Pillows every 1–2 years; sheets when they wear out. The Sleep Foundation says most experts recommend replacing pillows every 1–2 years and pillowcases every 1–2 years. Sheets have no fixed lifespan — replace them when they pill, thin out, tear, lose the elastic that holds them on the mattress, or still smell after washing.
Sources
Intervals vary by product, model and situation. When the manual or a professional says otherwise, follow them.
- How Often Should You Wash Your Sheets? — Sleep Foundation
- How Often Should You Replace Your Pillows? — Sleep Foundation
- How Often Should You Wash Your Sheets? — Cleveland Clinic (dermatologist Sean McGregor, DO)
- Cleaning Tips for Allergy and Asthma Sufferers — American Academy of Allergy, Asthma & Immunology (AAAAI)
- Dust Mite Allergy: How to Identify and Treat — Asthma and Allergy Foundation of America (AAFA)