Note 28 — SLEEP.

In high Health seven or eight hours will complete this refreshment, and hence arises the false inference drawn from an observation probably just, that long-lived persons are always early risers: not that early rising makes them long-lived, but that people in the highest vigour of Health are naturally early risers—- because they sleep more soundly, and all that repose can do for them, is done in less time, than with those who sleep less soundly. A disposition to lie in Bed beyond the usual hour, generally arises from some derangement of the Digestive Organs.—Hints for the Preservation of Health, p. 32.