Often sleep on your stomach, the main hazards of the following aspects: 1, for adolescent students, often sleep on your stomach may affect the development of the spine, because the development of the spine of adolescent students is not as perfect as adults, the cervical and lumbar spine have a normal physiological curvature, if it is a long time sleeping on your stomach, will change the normal cervical and lumbar physiological curvature, premature cervical spondylosis or lumbar spondylosis; 2, often sleep on their backs, the elbows of both hands will be in a state of pressure, long-term hand pressure will affect blood circulation, may cause numbness, stiffness of the hands; 3, often sleep on their backs, will affect the sleep state, because the posture, incorrect position will affect the quality of sleep, dizziness, weakness after waking up.