I recently found out about an interesting sensory deprivation device known as the Floatation Tank, invented by Neuro-physicist John C. Lilly in 1954. Basically it involves floating in a pool of salt water at body temperature in total darkness as well as total silence. This method of shutting off the senses allows for a very interesting kind of relaxation and allows the brain to experience the feeling of 4-6 hours of sleep in about 1 hour.
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