Why Experts Say Sleeping Naked in a Heatwave Might Actually Make You Hotter

Sleeping naked during a heatwave sounds like common sense, but experts warn it might make you even hotter—not cooler—by trapping sweat instead of letting it evaporate. So next time a tropical night hits, pajamas might actually save your sleep.
Sleep scientists note that in a UK heatwave, skipping pajamas means sweat pools on your skin, making cooling harder and even risking overnight dehydration. Lightweight cotton pajamas, a summer sleep hack, are trending as the best way to beat the record-breaking UK heatwave.