Having once accomplished the feat of walking at
nine A. M., I backed, in a space of seven or eight months, to eight
o'clock, to seven, to six, five, four, three; until at this point a
metaphysical fear fell upon me that I was actually backing into
'yesterday,' and should soon have no sleep at all. Below three,
however, I did not descend; and, for a couple of years, three and a
half hours' sleep was all that I could obtain in the twenty-four hours.
From this no particular suffering arose, except the nervous impatience
of lying in bed for one moment after awaking. Consequently, the habit
of walking before breakfast became at length troublesome no longer as a
most odious duty, but, on the contrary, as a temptation that could
hardly be resisted on the wettest mornings. As to the quantity of the
exercise, I found that six miles a day formed the _minimum_ which
would support permanently a particular standard of animal spirits,
evidenced to myself by certain apparent symptoms. I averaged about nine
and a half miles a day; but ascended on particular days to fifteen or
sixteen, and more rarely to twenty-three or twenty-four; a quantity
which did not produce fatigue, on the contrary it spread a sense of
improvement through almost the whole week that followed; but usually,
in the night immediately succeeding to such an exertion, I lost much of
my sleep; a privation that, under the circumstances explained, deterred
me from trying the experiment too often.
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