Does swapping just the pillowcase midweek help?

It helps your face and hair, which are in direct contact with it. Plenty of people change pillowcases every few days and sheets once a week. It's a good compromise if you've got oily skin and don't want to wash the whole set.

How many sets of sheets do I need?

Two per bed is the comfortable minimum: one on the bed, one clean in the closet. That way changing the bed never depends on the last set being dry.

Does the guest bed need changing every week too?

Not if nobody's slept in it. Change it after each visitor and keep it covered in between so it doesn't gather dust. Before the next guest, a quick airing is enough.

Is making the bed first thing in the morning a bad idea?

Not bad, but leaving the covers pulled back for a while, with a window open, lets the mattress and sheets lose the overnight moisture. Air it while you shower, then make it.

How often should you wash your sheets?

Wash your sheets and pillowcases once a week. That’s the advice from Cleveland Clinic doctors, and if weekly isn’t happening, two weeks is the outer limit. Duvets, comforters, blankets and pillows can go much longer: every few months is fine.

Why the rush with sheets? Because you spend the whole night on them, shedding skin, sweat and oil. According to the Cleveland Clinic, the average person sheds about 1.5 grams of skin cells a day, roughly half a teaspoon. That’s dinner for dust mites and bacteria, and a three-week-old sheet has a lot more of it than a one-week-old one.

How often to wash each piece of bedding

Item	How often to wash	Notes
Sheets and pillowcases	Once a week; every two weeks at most	More often in the situations below
Pillowcases (extra swap)	Optional, midweek	Handy if you have oily skin or hair
Mattress protector	Every few months, or right away if something spills	Follow the care label
Duvet, comforter and blankets	Every few months	More often in hot weather or if pets sleep on the bed
Pillows	About twice a year, if the label says they’re washable	Always use a pillowcase, plus a zip cover if you have allergies
Mattress	Clean every six months	Vacuum and spot-clean; see the mattress guide

The duvet, pillow and mattress timings are also the Cleveland Clinic’s. For the mattress itself, the step-by-step is in how to clean a mattress.

When to wash more often

Weekly is the general rule. The Cleveland Clinic suggests washing more often when:

you have allergies or asthma;
you sweat a lot at night, or it’s hot and humid;
your dog or cat sleeps on the bed;
someone is ill or getting over an infection;
you sleep naked;
the sheets have stains, smell, or feel a bit sticky.

In a heatwave with the fan going all night, twice a week makes complete sense.

Hot water, allergies and dust mites

The Cleveland Clinic recommends washing bedding in hot water, since the heat kills dust mites. If you’re allergic to dust mites, the American Lung Association advises washing bedding every week in water of at least 120°F (49°C) and using allergen-proof encasements on mattresses and pillows. The EPA gives the same weekly hot-wash advice for people with asthma.

A few practical notes:

In the US, the “hot” setting depends partly on your water heater, so check the care label and use the hottest setting it allows.
In the UK, most machines heat their own water, and a 60°C wash clears that bar comfortably, as long as the label allows it.
Whatever the setting, dry bedding completely before you put it away. Sheets stored damp go musty fast.

For detergent, drying a duvet and the rest of the washing details, see how to wash bedding.

How to keep it up without thinking about it

Knowing the answer is “weekly” is easy. Remembering is the hard part. What helps:

Pick a fixed day. Sunday morning, Monday night, whatever your cleaning day is. Sheets with a day don’t drift.
Have two sets per bed. One on, one in the closet. Change the bed now, wash whenever.
Strip and remake in one go. A bed stripped “to make up later” has a habit of still being bare at bedtime.
Wash everyone’s bedding together. One load for all the beds on the same day saves water, detergent and time. A simple laundry routine makes room for that load in your week.
Pair sheets with towels. Plenty of people swap both on the same day, so one reminds you of the other. The guide on how often to wash towels has the timing for those.

What if you don’t manage weekly?

Nobody’s coming round to inspect. The recommendation is about hygiene and comfort, not about making you feel bad. If every two weeks is your reality right now, start there and tighten it when you can: a fresh pillowcase midweek and airing the bed in the morning both help. And during a heatwave, a cold doing the rounds or a pet who’s claimed your bed, bring the change forward.