WHY ONE FEELS CHILLY WHEN LYING DOWN
The reason is simple: nature takes the opportunity when one is lying down to give the heart rest, and that organ consequently makes ten strokes less a minute than when one is in an upright posture. Multiply that by sixty minutes, and it is six hundred strokes; therefore, in eight hours spent in lying down, the heart is saved nearly five thousand strokes; and as the heart pumps six ounces of blood with each stroke, it lifts thirty thousand ounces less of blood in a night of eight hours spent in bed than when one is in an upright position. As the blood flows so much more slowly through the veins when one is lying down, one must supplement with extra coverings the warmth usually furnished by circulation.—N. Y. Journal of Health.