PHILADELPHIA (CBS) – It’s apparent that many single guys live in filth, but a new survey reveals they sleep in it as well.

According to the research, which was conducted by U.K. mattress company Ergoflex, single men between the ages of 18 and 55 only change their bed sheets an average of four times…per year!

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Furthermore, the average single guy owns just one set of sheets. Women, on the other hand, typically own three sets and change their linens every two-and-a-half weeks.

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Of the more than 2,000 people interviewed by the company, couples were the cleanest demo, washing their sheets about every two weeks.

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So if you’re one of those single dudes who don’t care for basic hygiene, consider this fact a wake-up call: Experts say the average person can sweat up to a liter a night and sheds thousands of dead skin cells.