Oh dear god look away Madhatters, a recent UK study revealed half a million Brits only wash their sheets three times a year, with Londoners and under 25s being the worst culprits. Urgh and here is useless fact for you, got a two year old pillow? Well 10% of it’s weight is comprised of dead skin and dust mites. Sweet dreams. Oh and recommended sheet change? At least once a week people, at least once a week.