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Demand for wellness devices that bring extreme temperatures indoors continues to heat up—or get cooler as the case may be. Cold plunges, cryotherapy chambers, infrared saunas, extra-hot steam rooms ...

Destynie Paige Photography / Destynie Paige Photography The blue light of the float cabin is very sci-fi, like a Kubrick movie. The water is soupy with Epsom salt, what I imagine amniotic fluid to be.

Then I stepped into an 8-by-6.5-foot sensory-deprivation tank containing about a foot of water with half a ton of Epsom salt dissolved in it.

A sensory isolation or "float" tank. Source: Galen Crout/Unsplash What happens when your mind disconnects from all outside sensations? First, you undress, put in earplugs, and step into a floatation ...