The Pedestrian's Record

98 the pedestrian's record. necessitated during the day isresupplied energetically during the periods of slumber. Of course, this pro­ cess is always in operation, but we may assume that during hours of activity the reconstructive force cannot be so energetic as during periods of repose ; in fact, all physiological research on this subject con­ tributes in asserting that both mental and bodily exertion require more sleep than indolence and in­ activity. We now come to the consideration of how much sleep a person of moderate activity shouldtake. Great difference of opinion exists : some,and among them medical men, state that six hours is sufficient for a man, and that if indulged in beyond this period, lassitude supervenes. In such a matter as the one before us, there can be no more mistaken notion than to suppose that a hard and fixed law can be enacted to determine a defined period of sleep. John Hunter required only five hours, Nalder only four ; and there are many men we know at the present day who say they cannot do without nine hours' sleep. There is much also in the intensity of slumber: some men enjoy as profound repose as an infant, whilst others pass restless nights, and consequently do not rein- vigorate their system so thoroughly as better sleepers; and, moreover, although they remain in bed nine hours, may not have slept more than four hours. Plethora, well sustained by food, combined with active digestion, induces prolonged sleep, whereas the wiry and athletic temperament seldom indulges in slumber of long duration, but it is usually intense, and con­ sequently invigorating.