Zero gravity allows you to relax every single muscle, your neck, arms, back, and even ears.  The tank enables you to find those areas you are holding tense so you can let go. The tank creates a state of sensory relaxation as the mind and body are shielded from all the external stimulation. The brains normal workload is reduced by up to 90%, the body conserves energy and has a chance to heal and rejuvenate itself.  Floating in darkness allows areas of the brain which are always in use when awake to be liberated from their work. Tests have shown that there is a drop in electrical activity of the brain and you begin to generate theta brain waves, which are associated with deep relaxation. The darkness during floating also induces a balance between the left and right brain. There is a shift from the normally dormant left side of the brain (logical, analytical, rational) to the right side (intuition, mental clarity and creativity). For the first time both sides of the brain are in harmony and the balance creates allows you to use huge amounts of previously unavailable brainpower. One of the major sources of stimulation in humans is the temperature gradient change on the surface of the body. Temperature inside the float tank is isothermal over the surface of the body so that the nerve endings covering the surface of the skin no longer perceive a separation between the skin and the solution inside the tank.