Please refresh the page and retry. G ood news, fans of sleeping in the nude: there is an excuse to air yourself at night-time. Tight boxers are the biggest offenders here - they increase the temperature of the testicles, which can cause the quality of a man's sperm to decrease. Ditching them in favour of loose underwear during the day and nothing at night can bring about a 25pc increase in sperm quality, according to the research.
Many people wear pajamas, large tees and underwear, or another type of comfortable attire in bed.
Sleeping bags are designed to trap the heat your body produces and prevent it from escaping. When you wear long underwear in a sleeping bag, you increase the amount of insulation between your skin and the cold air outside. This will make you warmer than if you sleep naked.
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