The weakness and lack of energy always want to sleep may be excessive fatigue, malnutrition, hypothyroidism and other conditions, need to be specifically analyzed. 1. Excessive fatigue: If you are under pressure from work and life, and do not get enough sleep for a long period of time, you will experience fatigue and want to sleep all the time, and you need to adjust your life and work and regulate your work and rest. 2. Malnutrition: Malnutrition can be caused by insufficient diet, absorption disorders, excessive consumption, etc. When malnutrition occurs, symptoms such as weakness and fatigue may occur, and may be accompanied by emaciation, retarded growth and development of children. 3. Hypothyroidism: Hypothyroidism is due to the lack of thyroid hormone secretion, the body’s metabolism will slow down, resulting in weakness, fatigue symptoms, can also be accompanied by edema, apathy and other symptoms. There are many reasons why you may feel weak and tired and want to sleep, so it is recommended that you consult a doctor as soon as possible to avoid delaying your condition.