Many associate Sensory deprivation with torture but short-term sessions have been described as relaxing and conducive to meditation. Sessions of up to 24 hrs for therapeutic purposes are referred to as Restricted Environmental Stimulation Therapy (REST) There is a substantial amount of research in treating addictive behaviors with REST is reviewed with smoking, overeating, alcohol consumption, and drug misuse. There are two types: Flotation REST and Chamber RESTIn chamber REST, subjects lie on a bed in a completely dark and sound reducing (on average, 80 dB) room for up to 24 hours. Their movement is restricted by the experimental instructions, but not by any mechanical restraints. Food, drink and toilet facilities are provided in the room and are at the discretion of the tester. Subjects are allowed to leave the room before the 24 hours are complete; however, fewer than 10% actually do. With regard to the article, I would be concerned as some studies have had participant experience hallucination after 48 hrs.