7-year-old children sleeping at night with trembling hands and feet may be related to physiological tremor, epilepsy, high fever and other causes. 1. Physiological tremor: If the cells of the cerebral cortex of a 7-year-old child are more active at night when he sleeps, it can cause tremor of the hands and feet. 2. Epilepsy: If a child has an epileptic seizure while sleeping, it can lead to loss of muscle control and tremor of the arms and legs. 3. Hyperthermia: This can be manifested as convulsions of the limbs in the presence of hyperthermia, which can be manifested as tremors of the hands and feet. Parents are advised to take their children to the hospital in a timely manner to clarify the cause, and if treatment is needed, standardized treatment should be carried out under the guidance of the doctor, so as to avoid adverse effects on the body due to the delayed condition.