The Daoist Ni Wan Zu said: "For one hundred days, banish sleepiness. Sleepiness and confusion make the mind scattered and disordered, and you lose the real practice." Having a scattered and disordered mind is one of the most common experiences of beginners, with their Yi (wisdom mind) unable to control Xin (emotional mind). Though Yi is strong, Xin is even stronger, so first strengthen Yi and regulate Xin, and analyze the causes and possible results of the disturbance.
If sleepiness is the result of fatigue, it is best to stop practicing, and relax or take a nap. Lie down comfortably, and pay attention to deep breathing as you bring your mind to the deep places of your body. Smoothly and slowly release the carbon dioxide, and every time you exhale, relax deeper. Breathing and heart rate slow down, and you feel rested, with your mind clear and your spirit fresh. Now raise your spirit, and keep it at its residence, centered, and balanced. Click to learn how Chinese medicine treats Obesity.
Sleepiness can also result from relaxation and a scattered mind. Keep your mind inside and observe your inner self. Bring your mind back to the third eye, and raise your spirit. After a few minutes, bring your mind back to the Real Lower Dan Tian (center of the abdomen) for Embryonic Breathing. If you are sleepy, do not use your mind to lead the Qi, which can be as dangerous as driving a car in that condition.