8 years old sleepy spirit bad may be related to insufficient sleep, central nervous system developmental abnormalities and other factors, the specific analysis is as follows: 1. Insufficient sleep: if the child usually sleeps late, it will lead to insufficient sleep, mental depression, drowsiness and other reactions, after making up sleep, the spirit will quickly return to normal. 2. central nervous system abnormalities: if the child appears above, excluding factors such as lack of sleep, may consider the central nervous system problems, such as encephalitis, meningitis, intracranial tumors, etc., accompanied by headache, vomiting and other adverse reactions. There may be other reasons for the 8-year-old’s drowsiness and poor mental health, so it is recommended to go to the hospital in time for the relevant examination, and after clarifying the cause of the disease, actively treat the symptoms.