It is difficult to fall asleep is called sleeping insomnia, the reason may be three situations: 1, caused by somatic diseases, such as pain, fever, panic, chest tightness, breathing difficulties, diarrhea and itchy skin, etc. This insomnia can be improved after the original disease is cured. 2, caused by excessive psychological stress caused by somatic diseases, such as malignant tumors, certain difficult diseases, etc. 3, caused by depression or anxiety caused by heart-related diseases. Such as husband and wife quarrels, interpersonal relationships, work problems, sexual conflicts and conflicts of guilt, concerns and worries about their own health or the diseases of others, etc. Insomnia caused by these reasons above, we call secondary insomnia. However, there are some insomnia for which no cause can really be found, and they are called primary insomnia.