Sleepiness may be caused by poor rest, insomnia, overexertion, high weather temperatures can cause vasodilatation, insufficient blood supply to the brain, easy to appear sleepy, tired and weak, some drugs can also lead to sleepiness, like paracetamol, Xythmin and some sedatives. You need to work and rest regularly, adjust your biological clock, avoid overworking and ensure sufficient sleep. If you have insomnia, you can also take glutamine, tranquilizer, vitamin B1, vitamin B12 to regulate sleep, and take brain CT and EEG to rule out brain lesions.