The controlled temperature and pressure of hot tubs offer a natural ... pre-sleep state leading to perfect sleep. In a hot tub, the water supports approximately 90 percent of your body weight ...

There are similar models just as popular on Wayfair, too.

Instead of adding chemicals directly to your hot tub, you add salt (about two pounds per 100 gallons of water), which dissolves to produce natural chlorine that's needed to keep your hot tub clean.

During my trip to Copenhagen, I had the chance to visit Copenhot Little Siberia on Refshaleøen, where I experienced the pure ...