Float therapy: what it does, what to expect & where to try it

Float therapy — also called floatation REST (Restricted Environmental Stimulation Therapy) or sensory deprivation — involves floating effortlessly in a shallow tank or room filled with highly concentrated Epsom salt (magnesium sulfate) solution. Approximately 1,000 lbs of Epsom salt per tank makes the water so buoyant that the body floats without effort at skin-temperature water (around 93–94°F), making the boundary between air and water nearly imperceptible. Tanks are enclosed and completely dark and silent, removing almost all sensory input. Most studios also offer open float rooms (cabin-style) for people uncomfortable with enclosed tanks. Sessions typically run 60 or 90 minutes. Float therapy is used for stress reduction, anxiety relief, sleep improvement, deep relaxation, muscle recovery, and pain management. The practice has a supportive research literature from the 1970s onward and has seen steady commercial growth as float spas have expanded across major US cities.

How float therapy works

The near-complete elimination of external sensory input during float therapy is thought to reduce cortisol (the primary stress hormone) and activate the parasympathetic nervous system — the 'rest and digest' branch governing recovery and relaxation. Research suggests a single 60-minute session can measurably reduce self-reported anxiety and muscle tension. The magnesium in Epsom salt may also be absorbed transdermally, though the extent and clinical significance of this absorption remain debated. Floatation REST has been studied for pain reduction, creativity, and athletic recovery with generally supportive early findings.

Typical cost: $60–$100 per session.