In this episode my guest, Nick Janicki ( @truerestspa ) talks about the benefits of a sensory deprivation tank, also called an isolation tank or flotation tank , which is pitch-black, light-proof, soundproof environment heated to the same temperature as the skin. Flotation tanks are widely advertised as a form of alternative medicine, but beneficial health effects are unproven. The tank is filled with 10 inches of water which contains enough dissolved Epsom salt to create a specific gravity of approximately 1.275. This environment allows an individual to float effortlessly on the surface of the water. The primary function of the isolation tank is to eliminate as many of the external senses as possible.