The parasympathetic nervous system is responsible for rest, digestion, falling asleep, feeling relaxed, and states of quiescence.

“the parasympathetic aspect of our autonomic nervous system is the one that sometimes referred to as the rest and digest neural circuits and chemicals and that's true but there's a lot more to the parasympathetic component of the autonomic nervous system it's also responsible for falling asleep it's responsible for us feeling relaxed it is responsible for most of the states of Mind and Body in which we are quiescent where we don't feel an Impulse to move or when we have a difficult time getting into action”