This is how often you need to change your bed sheets

Most people agree it’s a good idea to wash your face before bed. Some think skipping a night or two wouldn't really do much harm. But what if you were told all those exfoliating scrubs and clay masks made no difference unless you were doing one simple wash a week?

We spend most of our lives either on our feet or in our bed, but according to New York University microbiologist, Philip Tierno, our bed can quickly blossom into a “botanical park” of bacteria and fungus.

Every year, humans produce roughly 26 gallons of sweat in bed, and when this coincides with hot humid weather, it creates what scientists have dubbed the “ideal fungal culture medium".

Speaking to Business Insider, Tierno said that if left too long, the microscopic life within the wrinkles and fold of our sheets can even make us sick.