Experience deeper and more restful sleep through strong stimulation of the parasympathetic nervous system. While whole body cryotherapy naturally triggers a “flight or fight” response in the body, this will lead to a dramatic rise in parasympathetic nervous system activity 6 to 8 hours later. This is a key factor that influences how well you sleep at night. This means you can expect to feel completely rested and rejuvenated the day following a cryotherapy session!