Reaching a restful state in the zero-gravity environment in a floatation tank, the brain would begin a fascinating process. Endorphins are released by the brain as you float in the tank. These are powerful natural pain relievers and mood enhancers that promote a sense of well-being. It will also further enhance the healing benefits and sensation of relaxation created by the zero gravity environment.
Aside from endorphins released by the brain, your brainwaves will also shift into a theta state. Theta brainwaves are a rare brain state, normally achievable by people trained extensively in meditation. Floating can be considered as a short cut to achieving the deepest state of mind, and well being.