How often should you wash your sheets? A dermatologist's guide

Written by Travis Holloway
Senior Microbiologist at UCB · Last updated: August 2026

How often should you wash your sheets? For most people, the answer is once a week, every 7 days. You can stretch to 10 to 14 days if you shower before bed, sleep cool, and share your bed with no pets, but 2 weeks is the outer limit. If you sleep hot, break out on the side you sleep on, or let a pet in the bed, drop to every 3 to 4 days. Here is the part most guides skip: how dirty your sheets get by day 7 has less to do with your habits and more to do with what your sheets are made of. Cotton behaves like a sponge, holding the sweat, oil, and bacteria that make sheets feel grimy. Other fabrics are engineered to move that moisture through the fiber and release it, so the surface you sleep on stays cleaner for longer. Below is the full schedule, the reasons behind it, and how to wash your sheets so they actually get clean.

In this article

• How often should you wash your sheets?
• Why does it matter how often you wash your sheets?
• What happens to your skin if you wait too long?
• How to wash your sheets the right way
• The variable most guides skip: what your sheets are made of
• How to keep your sheets fresh longer between washes
• Frequently asked questions

How often should you wash your sheets?

The consensus among dermatologists and sleep experts is to wash your sheets once a week. That is the number the Sleep Foundation and Cleveland Clinic both land on. Weekly keeps the buildup of sweat, oil, dead skin, and bacteria from reaching the point where you can feel it. Some situations call for washing more often. Use this quick schedule. The duvet layer runs on its own, longer cycle, which our guide to what a duvet cover is explains.

One exception worth calling out: your pillowcase. Your face rests directly on it for the whole night, so it collects oil and bacteria faster than the rest of the bed. Aim to wash or swap your pillowcase every 2 to 3 days, especially if you are breaking out. Our dermatologist's guide to pillowcase hygiene covers that in detail.

Why does it matter how often you wash your sheets?

Because your bed collects more than you think. Every night your body sheds skin cells, sweat, and natural oils into the fabric. Cleveland Clinic estimates the average person sheds around 1.5 grams of dead skin a day, and that becomes food for dust mites, whose waste is a common allergy and asthma trigger. Add the bacteria that feed on the oil and moisture, plus anything your pet tracks in, and an unwashed set of sheets slowly turns into a warm, damp, well-fed surface.

The word that matters there is damp. Bacteria and dust mites need moisture to thrive, and this is where the fabric does half the work for you. Cotton is absorbent by design, so it holds a thin film of sweat and oil at the surface all night, right where microbes want it. A fabric that moves moisture away instead keeps that surface drier and far less hospitable. That is the difference between sheets that feel grimy by day 5 and sheets that still feel fresh at day 10.

What happens to your skin if you wait too long?

If you have ever noticed you break out on the side you sleep on, your sheets and pillowcase are a likely suspect. As oil and bacteria build up in the fabric, they transfer back onto your skin and settle into pores over the 8 hours you lie there. For acne-prone or sensitive skin, a surface that is overdue for a wash can quietly undo the skincare you spent money and time on. Washing on schedule helps. Sleeping on a fabric that holds less bacteria in the first place helps more.

This is why the fabric question is really a skincare question. CloudThera™, Dreamey's eucalyptus lyocell, transports moisture through the fiber and releases it as vapor, so the surface stays drier and harbors 3x less bacteria than cotton, per Hohenstein Institute testing. Less bacteria against your face means less of the overnight buildup that works against clearer skin.

How to wash your sheets the right way

Frequency is only half of it. How you wash your sheets decides whether they actually come clean and how long they last. Five steps cover it.

1. Wash on schedule, on a gentle or normal cycle. Strip the whole bed, including the pillowcases, and wash sheets on their own rather than crammed in with a heavy load, so they have room to actually rinse.
2. Use the right water temperature. For cotton, warm to hot water, up to 140°F (60°C), dissolves oils and kills dust mites. For delicate fabrics like silk, satin, and eucalyptus lyocell, wash cold or lukewarm on a gentle cycle to protect the fibers. When in doubt, follow the care label.
3. Skip the fabric softener and bleach. A mild detergent is enough. Fabric softener leaves a waxy residue that coats the fibers and reduces breathability, and bleach breaks fabrics down faster.
4. Dry promptly and gently. Tumble dry on low or line dry, and take sheets out while they are still slightly cool rather than baking them. Never leave damp sheets sitting in the machine, where mildew and odor start within hours.
5. Air the bed before you make it. Pull the covers back for a few minutes each morning so overnight moisture can evaporate instead of getting sealed in. It is a small habit that keeps the bed fresher between washes.

Two common questions, answered quickly: wash your sheets separately from towels, because towels are abrasive, shed lint, and dry at a different rate. And yes, wash new sheets before the first use to rinse out manufacturing finishes and freshen the fibers.

The variable most guides skip: what your sheets are made of

Almost every article stops at "wash weekly." The more useful lever is the fabric itself, because it decides how quickly your sheets get dirty in the first place. Here is how cotton compares to engineered eucalyptus lyocell on the things that actually build up. The same logic decides what to look for when you buy, which is why the best thread count for sheets turns out to be the wrong question to ask.

CloudThera figures from independent testing: bacteria and odor via the Hohenstein Institute, moisture vapor transmission via independent textile laboratory (570 vs 425 g/m²/h). Cotton values reflect general fabric characteristics.

CloudThera is finished with DermaWeave™, the proprietary finishing process that refines each fiber into an ultra-smooth, skin-friendly surface. Because it resists bacteria and odor rather than soaking them up, it earns the "wash less, enjoy more" habit: it stays fresh 2 to 3 times longer between washes than cotton, so you run the machine less and the sheets last longer. That is temperature-regulating, low-maintenance, and measured, not marketed. If you want the deeper fiber comparison, see our guide to eucalyptus vs bamboo vs cotton sheets.

How to keep your sheets fresh longer between washes

If you would rather not strip the bed twice a week, most of the buildup is preventable. These habits keep sheets cleaner for longer without shortening the schedule to the point of chores.

• Shower before bed to rinse off the day's sweat, oil, and product before it transfers to the fabric.
• Remove makeup and let heavy night creams absorb before your face hits the pillow, so less of it ends up in the weave.
• Keep pets off the bed when you can, or wash every 3 to 4 days if they sleep with you.
• Air the bed each morning before making it, so overnight moisture evaporates.
• Rotate two sets of sheets so each gets a full rest and wears more slowly.
• Choose a bacteria-resistant fabric. The single biggest lever is starting with a surface that stays drier and holds less bacteria, so it simply gets dirty more slowly.

Frequently asked questions

How often should you wash your sheets if you shower before bed?

Showering before bed helps, but it does not replace washing. You still shed skin cells, sweat overnight, and transfer some oil, so stick to roughly every 7 to 14 days. Showering first is what earns you the two-week end of that range rather than the one-week end.

What is the best temperature to wash sheets?

For cotton, warm to hot water, up to 140°F (60°C), dissolves body oils and kills dust mites. For delicate fabrics like silk, satin, and eucalyptus lyocell, wash cold or lukewarm on a gentle cycle to protect the fibers and prevent shrinkage. Always defer to the care label if it specifies.

Can you wash sheets and towels together?

It is better not to. Towels are heavier and abrasive, they shed lint that clings to sheets, and they dry at a different rate. Washing sheets on their own lets them rinse fully and protects the smooth surface, especially for finer fabrics.

Should you wash new sheets before using them?

Yes. A first wash rinses out manufacturing finishes and any residue from packaging, and it softens the fabric. Follow the care label, and for eucalyptus lyocell that means a cold or lukewarm gentle cycle.

How often should you wash your sheets if you sleep hot or have night sweats?

Every 3 to 4 days, because sweat leaves more moisture and salt in the fabric for bacteria to feed on. A more breathable, temperature-regulating fabric reduces how much moisture lands there in the first place. For a full breakdown, see our guide to the best sheets for hot sleepers.

Do eucalyptus or lyocell sheets need to be washed less often?

They hold up longer between washes. Because eucalyptus lyocell keeps the surface drier, it harbors 3x less bacteria and 60% less odor than cotton (Hohenstein Institute), so it stays fresh 2 to 3 times longer. For skin health you should still wash roughly weekly, but the sheets will feel and smell clean well past the point cotton starts to turn.