The best reason to go out and buy a mattress immediately

I've been subscribing to the Health Tip of the Day from Health Coach Training for some time now and, to be honest, I haven't really learned a lot from them - until yesterday, when this little gem arrived in my inbox:

'It is best to get a new mattress every 7 - 10 years. Mattress weight will double in size from perspiration, oils and dust mites.'

Yuk. How disgusting is that?