Parents often ask at the pediatric clinic: Is it a calcium deficiency if their child sweats a lot after sleep? Why is the effect of calcium supplementation not obvious? In fact, there are many reasons why children sweat a lot after sleep, not just because of calcium deficiency. If a child sweats soon after falling asleep, it is normal for the child to sweat because the blood flow in the whole body is still fast when the child gradually enters the inhibited state from the excited state, which is more common in active children. You can not cover the quilt too much when the child starts to sleep, and then cover the quilt well when it is completely in a stable state after sleeping, and pay attention to the air circulation in the room. Some children sweat a lot when they fall asleep, especially on the head, and often shake their heads due to the stimulation of the scalp by sweating, and a circle of hair loss can be seen on the back of the child’s occipital area, accompanied by increased neuroexcitability, such as jumping, crying or restlessness. These conditions may be early manifestations of rickets, and require examination and treatment at a child health clinic, mostly in children between 0 and 1 year old. If the child does not sweat when he or she falls asleep, and then sweats profusely after a period of time, especially in the second half of the night, this is called “night sweats”. If the child also has a pale or yellowish complexion, low spirits, poor appetite, low fever and cough, the child should be examined in the hospital to rule out tuberculosis.