In winter, going to bed early is advisable to nourish the human yang qi while getting up late is suitable for protecting yin and essence. This is because that retiring to bed early and rising late can help yang qi descend and conceal, yin and essence accumulate so as to maintain the balance of yin and yang of the human body. Do not work until the sun rises; avoid cold and approach heat to prevent external cold from impairing yang. In addition, adopt the heating devices to maintain a proper room temperature. Very low room temperature may impair human yang qi and make people subject to common cold; very high room temperature makes the skin striae open, yang qi unable to conceal, but pathogenic cold easily invade the body, giving rise to affection by exopathogen and other diseases. Learn more information, please read Relationship Between Spleen and Stomach.