"The stomach, when we lie down to rest, should have its work done, that it may enjoy rest, as well as other portions of the body. The work of digestion should not be carried on through any period of the sleeping hours."

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Digestion is quickly shut down during stress…The parasympathetic nervous system, perfect for all that calm, vegetative physiology, normally mediates the actions of digestion. Along comes stress: turn off parasympathetic, turn on the sympathetic, and forget about digestion.

— Robert M. Sapolsky