Float Therapy: How It Works and Why It Helps What Is Float Therapy? Float therapy, or REST (Restricted Environmental Stimulation Therapy), involves floating in warm, magnesium-rich water free of light and sound. This sensory-free environment lowers stress hormones, shifts the body into "rest and digest" mode, and promotes deep relaxation. Research shows floating reduces amygdala activity (the brain's stress centre), alters brainwaves to theta states linked with meditation and creativity, relieve