THOSE who sleep in their underwear or boxers can end up compromising their fertility.

This was revealed by various doctors, who claim sleeping in underwear could lead to a host of health problems.

This is supposedly because constricting underwear affects the body’s ability to regulate temperature and hygiene between fabric and the skin, creating problems including irritation and infection.

‘Your nether regions need to be just the right temperature to optimise sperm production. Men who sleep in boxers or briefs can end up compromising their fertility,’ warned Dr Brian Steixner of the Institute for Men’s Health.

Dr Alyssa Dweck, a fertility expert from New York, said it is better to strip off completely at night to let your nether regions ‘breathe’.

‘If the area is constantly covered – especially by a fabric that’s not moisture-wicking or absorbent – then moisture collects, creating the perfect breeding ground for bacteria or yeast,’ she said.

In extreme cases this could lead to severe chafing, irritation and infections.

However, Dr Dweck advised that anyone who wasn’t keen on the idea of going without underpants at night could opt for a loose-fitting cotton pair.

‘If there’s ever a time to break out the granny panties, then this would be it.’ she said.

Previous studies have shown that sleeping in the nude can lower blood pressure.

However a survey in Brazil – traditionally seen as an uninhibited society – found that only 18 percent of women in the country felt comfortable going without underwear in bed.