MINNEAPOLIS—Hoping to combat the relentless winter chill, Greg Larson has created what he calls a “dryer bed,” a full-sized mattress designed to tumble and warm the sleeper. “I’d climb in with the socks if I could,” he mused, plugging in his invention.

“It’s a little bumpy but very toasty,” said Larson, describing his nightly routine, which now includes lint-brushing his pajamas before work. The city’s residents eagerly await their chance to tumble into Larson’s invention.

Experts have noted potential health risks but were dismissed by Larson. “If cave people survived sleeping on rocks, I can handle a few jostled vertebrae,” he insisted. Insiders report that Larson’s next innovation includes a fitted sheet adapter to prevent rogue static shock.