" find it essential to be able to relax completely irrespective of anything that is going on in the environment at certain times. Sometimes I wake up in the middle of the night with an idea that I want to work out, so rather than disturb my wife, I float in the tank and work out the idea at great length and in fine detail. I am then able to put it down on paper or to dictate it in the morning. For a businessperson, a scientist, a professional of any sort, this is a boon: to be able to think, free of physical fatigue of the body. The method allows one to become free within a few minutes. "

― John C. Lilly , The Deep Self: Consciousness Exploration in the Isolation Tank