Better let in cold air and put on more bedclothes, as long as you do not sleep in a draught.
Oxygen keeps up the animal heat of the body, and you can really keep warmer in a room with plenty of fresh air than in a close room where the air is vitiated.
But in the sick room fresh air is of paramount importance, not only for the patient, but for the attendants, who are otherwise compelled to inhale the poisonous exhalations from the diseased body.
Let no consideration blind you, either in sickness or in health, to the imperative necessity of plenty of fresh air.
The next great natural agency, and one to which scant attention is paid, compared with its hygienic importance, is Light, but more especially Sunlight.
Light is essential to life. If by some monstrous cataclysm the sun was suddenly extinguished, it is impossible to conceive the misery that would follow. In the event of such a fearful calamity it would require but a very short time to depopulate the earth. We repeat, light is a necessity of existence, and it behooves us all to allow it free access to our dwellings. What if it does bleach carpets and draperies! Its beneficent effects are not to be measured by yards of wool and silk. Love of light is as instinctive as the aversion to darkness. Plants growing in a dark cellar, where but one struggling ray of light enters, will instinctively grow in the direction of that ray. It is questionable whether defective lighting is not productive of as much physical deterioration in the crowded tenement districts as defective ventilation--certainly it is only secondary in degree. Light is necessary. Light is free to all, and why human beings endowed with reason should attempt to exclude it from their dwellings is a thing that passes comprehension. Give the light free access to your dwelling. “Let there be light,” is as imperative now as when the fiat went forth at the dawn of creation.
But Sunlight is the great health-giving agent. The sun is the great source of life. Its rays stimulate the growth of every living organism, and there is no doubt but they exert a chemical action upon living tissue with which we are as yet but imperfectly acquainted. This fact has been recognized of late years, hence our winter resorts are liberally supplied with sun parlors, in which those in quest of health may enjoy the rejuvenating effect of solar heat without exposing themselves to the inclemency of wintry weather. This is a revival of an old Roman custom, for the more opulent of that nation had sun baths on the roofs of their dwellings. Sunshine is as necessary to robust, vigorous health as either air or water. Then seize the full enjoyment of it whenever opportunity offers! It is a stimulant and tonic that has no superior. Go forth into the sunlight on every possible occasion! It is one of Nature’s greatest therapeutic agents, and she bestows it ungrudgingly, without money and without price. If you are wise you will avail yourself of her bounty.