The inability to sleep flat on the back and only on the side may be due to heart problems, including cardiac insufficiency caused by various organic heart diseases. Patients can use acetyl trichoside injection to improve symptoms as advised by their doctor. The increase in the amount of blood returning to the heart when lying flat on the back can exacerbate the symptoms of pulmonary congestion and can make it feel impossible to sleep. In addition, the patient may have emotional tension and anxiety, or some sadness may also lead to poor sleep. When heart function is impaired, patients with chronic cardiac insufficiency are also unable to lie down flat, and have to rest on their sides or sit up straight. At this time, medications to enhance heart function, such as deacetyltrichoside injection, can be taken to improve the above clinical symptoms. Therefore, if you often can’t sleep flat on your back but can only sleep on your side, you need to go to the hospital for appropriate examination first. Electrocardiogram, dynamic electrocardiogram and color Doppler ultrasound of the heart can be done to see if there is a heart problem.