Let
eight hours, then, be regarded as the ordinary period required for
sleep by an industrious people like the Americans.
It thus appears that the laws of our political condition, the laws ofthe
natural world, and the constitution of our bodies, alike demand
that we rise with the light of day to prosecute our employments, and
that we retire in time for the requisite amount of sleep.
In regard to the effects of protracting the time spent in repose, many
extensive and satisfactory investigations have been made. It has been
shown that, during sleep, the body perspires most freely, while yet
neither food nor exercise are ministering to its wants. Of course, if
we continue our slumbers beyond the time required to restore the body
to its usual vigor, there is an unperceived undermining of the
constitution, by this protracted and debilitating exhalation. This
process, in a course of years, readers the body delicate and less able
to withstand disease, and in the result shortens life. Sir John
Sinclair, who has written a large work on the Causes of Longevity,
states, as one result of his extensive investigations, that he has
never yet heard or read of a single case of great longevity where the
individual was not an early riser.
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