Weakness, drowsiness may be cerebrovascular disease, drug overdose, carbon monoxide poisoning, etc., need to be specifically analyzed. 1. Cerebrovascular disease: ischemic cerebrovascular disease, due to insufficient blood supply to the brain will appear fatigue, drowsiness, can also be accompanied by hemiparesis, dizziness, headache and other symptoms. 2. Drug overdose: sleeping pills such as eszopiclone, zopiclone, etc., if there is an overdose of drugs, there may be fatigue, drowsiness, accompanied by bradycardia, muscle weakness and other symptoms. 3. Carbon monoxide poisoning: After carbon monoxide poisoning, due to the lack of oxygen in the brain tissue, there will be weakness and drowsiness, which can also be accompanied by nausea, dyspnea, vomiting, cherry-red lips and other symptoms. There are many causes of fatigue and drowsiness, and it is recommended to consult a doctor for a clear diagnosis in time to avoid delaying the condition.