By Mariam Khan A doctor has revealed the ‘magic’ number of times you should wear your pyjamas before washing them and it has divided the internet. According to Dr Jason Singh from Virginia, you shouldn’t wear your pyjamas for several days in a row and definitely shouldn’t be wearing the same pyjamas for weeks on end. The doctor has said that continuing to wear the same pyjamas could lead to a build-up of “dead cells, oils and other substances.” A build-up of all of this can lead to bacteria growing and the last thing you need is sleeping in unclean clothes. Even as the doctor revealed the numb…