The symptoms of drowsiness, light-headedness and lack of wakefulness in the morning are mostly caused by the following reasons: 1. Long-term insomnia or frequent late nights, where the brain does not get sufficient rest; 2. In certain pathological states, such as hypertension, diabetes or long-term inactivity, the blood flow is slower or the blood supply is insufficient. If this symptom still exists after the patient has improved his sleep state, it is recommended to go to the hospital for transcranial Doppler testing of cerebral blood flow velocity so that the doctor can determine whether there is insufficient blood supply to the cerebral arteries.