This document discusses different states of consciousness including hypnosis, meditation, and sensory deprivation. Hypnosis is described as an altered state of focused attention and openness to suggestion that is not mysterious, but can be explained by normal principles. Meditation focuses attention to produce relaxation or awareness and distinct brain patterns, taking two main forms: concentrative on a single object and receptive embracing non-judgmental awareness. Sensory deprivation reduces stimulation and while relaxing for some, can cause strange sensations for others in monotonous situations. Benefits are discussed for hypnosis, meditation and sensory deprivation including relaxation, lowered stress, and improved physical health.