If you feel uncomfortable how to lie down when you sleep, there are usually the following diseases: 1, the most common disease is heart disease, especially heart failure is unable to lie down and sleep flat, usually willing to take a sitting breathing and semi-recumbent position. At this time, such as lying down when the return blood volume will increase, will increase the load on the heart, especially the increase in the afterload of the heart is obvious, so it will feel uncomfortable to sleep how to lie, can only sit and breathe to breathe smoothly. 2, in chronic pulmonary heart disease, pulmonary hypertension, hypertension, such diseases sleep how to lie uncomfortable, usually need to sit, and is the leg down position to allow ventilation. 3, in chronic obstructive pulmonary disease, how to lie uncomfortable, usually need to sit, and is the leg down position to allow ventilation. In chronic obstructive pulmonary disease, no matter how you sleep, you will not feel comfortable when you sleep.