A tendency to resume the same mode of action at stated times...

A tendency to resume the same mode of action at stated times is peculiarly the characteristic of the nervous system; and on this account regularity is of great consequence in exercising the moral and intellectual power. All nervous diseases have a marked tendency to observe regular periods; and the natural inclination to sleep at the approach of night is another instance of the same fact.

George Combe Quote About Sleep, Exercise, Night: A Tendency To Resume The...

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