Habitual clients and advocates of sensory deprivation will tell you that the longer you float the better it gets and the more your body rebuilds.
In the Isolation Tank, there is no need to fight gravity or deal with sensory input, allowing your body to reallocate that energy. Some people float to relieve stress, significantly reduce anxiety, some to eliminate chronic pain, others fight addiction and all experience true relaxation, allowing muscles to fully release and expedite recovery.