General normal people sleep lying flat or lying on the side have their own benefits, choose their own more favored or feel more comfortable sleeping position can. In addition, normal people will sleep in the process of turning over many times, and will not be limited to a certain sleeping position, so lie down when using what kind of position and do not care too much. 1, lying down: normal people lying down to sleep, not compress the body organs and limbs, is conducive to blood circulation and respiratory metabolism, not easy to produce fatigue, can avoid the process of sleeping back and forth. Lie flat can also maintain the symmetry of the body, so that the body is evenly stressed on both sides, which in turn can avoid long-term lying on the side of the skin pressure and numbness of the limbs; 2, side lying: normal people lying on the side more secure, the sleep process is more stable. And side lying can reduce the force on the spine, for obese, pregnant people because of the abdominal weight, it is recommended to choose to sleep on the side. Especially pregnant women can choose to sleep on the left side of the bed, and obese people can alternate sides to sleep on the side to reduce the weight of the abdomen on the body. In addition, the right side of the bed can reduce the body to a certain extent the compression of the heart, palpitations, panic and other people can choose to lie to the right. It should be noted that children are more active, lively, relatively difficult to fall asleep, in order to ensure the quality of sleep and sleep time for children, should avoid turning children in sleep to adjust the sleeping position. And the elderly sleep quality is poor, after falling asleep is not recommended due to adjust the sleeping position and wake them up, affecting their sleep quality.