Commonly known as Floatation Therapy, Sensory Deprivation, or R.E.S.T (Restricted Environmental Stimulation Technique), is the practice of floating on your back about half in and half out of the saltwater solution within a float tank (also commonly referred to as a sensory deprivation tank or isolation tank). The tank is completely dark, silent, and you won't be fighting gravity; floating is about everything you won't be doing. You can always turn the lights on, open the tank door or exit the tank at any time. You are in total control of your environment