Speaking to the Daily Mail, she explained that it's best to change your pyjamas every single day. If you shower before bed and aren't very sweaty, you might be able to stretch that to three or four wears at a push. However, most people are putting themselves at risk of developing bad body odour and even harmful infections by repeatedlywearing the same pair of pyjamas.
As a result of [there not being a lid], there's that plume that comes from the toilet that ends up on the seat, and no matter where you go, you're always going to find that about 50% of the [public restroom] toilet seats at any given time are going to have some kind of poo germs on them in the range of hundreds [of particles].