During the night, of all times, fresh air is needed, for less is
used, and what little is breathed should be of as good quality as
circumstances permit. Open the windows wide enough to have the air
constantly changing in the bedroom. During the winter it will be
necessary to put additional clothes on the bed, for no one can obtain
the best of slumbers while chilled. Some may find it a better plan to
use artificial heat in the foot of the bed. At any rate, during cold
weather better covering is required for the legs and for the feet than
for any other part of the body. People with good resistance can sleep in
a draught without the least harm, but ordinary people should not sleep
in a draught. It is easy to use screens so that the wind does not blow
upon the face. If the air is kept stirring in the chamber the sleeper
gets enough without being in a current.
Some are in the habit of closing their bedroom windows and doors at
night and opening them for a thorough airing during the day. If the
bedrooms must be closed, close them during the day and open them wide at
night, for that is when the pure air is needed. It does not make much
difference whether they are open or closed while being unoccupied.
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