There are many reasons why the brain does not produce sleepiness, as follows: First, the brain produces sleepiness because the neurocentral system of the cerebral cortex is subjected to some kind of inhibition, which makes people go to sleep, if the neurocentral system is in an excited state, it will not produce sleepiness, and will not go to sleep. Second, if the patient does not sleep, consider the possible symptoms of insomnia, in general, it is recommended that patients do not give themselves too much pressure, maintain emotional stability, before going to bed, you can drink a glass of hot milk or soak your feet in hot water, which helps to carry out deep sleep. Third, before going to bed, you can not drink stimulating drinks, such as strong tea, coffee, carbonated beverages, which can lead to excitement in the cerebral cortex, or watching films with tense and exciting plots, or watching cell phones for a long time, which can cause the brain not to produce sleepiness.