The main reasons for wanting to sit and lie down are related to malnutrition, anemia, overwork, lack of muscle strength, and decreased spinal stability. 1. Malnutrition, anemia: if there is malnutrition or anemia and other problems or, there will be tiredness and weakness, no spirit of performance, so that the phenomenon of standing want to sit, sitting want to lie down. 2. Excessive fatigue: If you are overworked, such as prolonged strenuous exercise or weight-bearing labor, it is easy to produce a feeling of physical fatigue, which can lead to the phenomenon of wanting to sit, wanting to sit and wanting to lie down. 3. Insufficient muscle strength: If the body has insufficient muscle strength, such as the body is weak, it is easy to affect the body’s posture to maintain, so when standing, want to sit, and when sitting, want to lie down. 4. Decline in spinal stability: usually if there is a lack of exercise for a long period of time or poor posture, the problem of decline in spinal stability, easy to affect the sitting and standing posture, thus triggering the performance of wanting to sit when standing, wanting to lie down when sitting. If you suffer from other chronic consumptive diseases, it will also lead to fatigue and weakness, which will make you want to sit and lie down. It is recommended that people with this phenomenon should consult a doctor in time to find out whether there are disease factors, and actively treat and adjust, usually pay attention to the combination of work and rest in daily life, to ensure balanced nutrition.