While most of us make sure we wash our bed sheets and duvet covers regularly are pillows and duvets are often woefully neglected.
A recent survey by SilentNight revealed one in five of us sleep on pillows so dirty that a quarter of their weight is made up of dead skin cells and dust mites - gross.
And, according to the research, one fifth of us haven't washed our pillows in five years. Five years! But how do we know how often we should wash them?
Dr Lisa Ackerley, also known as The Hygiene Doctor says a lot of people who suffer from runny noses or coughs do not know that dust mites can be the cause - and they can even cause asthma and eczema.
Read more on mirror.co.uk