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  1. Home
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How often should you wash bed sheets?

Leaving it too long can turn sheets into 'botanical park of bacteria'. - by Laura Barry
  • 28 Jul 2020
How often should you wash bed sheets?
Getty Images

Considering humans usually spend about one-third of their lifetime snuggled up and asleep in bed, it stands to reason that our sheets, pillows and duvets are probably a whole lot filthier than we imagine. So according to the experts, how often should you wash your bed sheets? 

According to New York University microbiologist, Philip Tierno, leaving your sheets too long in between washes can turn them into a "botanical park of bacteria”.

In an interview with Business Insider, Tierno recommends washing your sheets once a week.

“Humans naturally produce roughly 26 gallons of sweat in bed every year. When it’s hot and humid outside, this moisture becomes what scientists call an “ideal fungal culture medium.

"If you touched dog poo in the street, you'd want to wash your hands," Tierno said. "Consider that analogous to your bedding. If you saw what was there — but of course you don't see it — after a while, you have to say to yourself, 'Do I want to sleep in that?'"

bedroom
Krystal Sagona/Interior Flow

However, Good Housekeeping Institute recommends if you've been sick with a virus or infection, you should change your sheets as soon as you start to recover to ensure you aren't rolling around in your own germs. 

At the very least, bed sheets should be washed once every two weeks, and more often during summer months, according to the French Bedroom Company. 

Bed sheets
Getty

Similarly, if you suffer from night sweats, it's better to wash you sheets a little more often that once a week, up to once every 4-5 days. 

Bed sheets
Getty

A pillowcase should be changed every 2 days according to Koala Product Manager Stephanie Roberts-Baxter. A recent study found that even after a week of washing, the average pillowcase still has over 170000% the number of bacteria as a toilet seat. Per square inch, they contain 24.90% bacilli, 40.76% gram negative rods, 11.58% gram positive cocci, and 22.75% gram positive rods.

In a nauseating revelation, the technical director of Gabriel Scientific, said ‘if you had to come up with a medium to cultivate bacteria, a pillow is pretty much as good as you can get. It is a wet sponge that absorbs bodily fluids of various kinds providing nutrients. It is kept at the ideal temperature by the warm body lying on top.”

You might also like:

How often should you change your mattress?

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How often should you wash your duvet?

How often should you change your toothbrush?

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Laura Barry
Laura Barry
Laura Barry is a writer, bookworm and interior design enthusiast with a love for reporting on all things homes, travel and lifestyle. When not tapping away at her keyboard, Laura can be found making endless cups of tea or perusing the shelves of Sydney’s many bookstores.

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