The brain does not produce sleepiness means that the cerebral cortex has been in a state of excitement, caused by emotional excitement, too much sleep, nervousness, stress, hyperthyroidism, cerebrovascular disease, drinking coffee or strong tea before going to bed and so on. The reasons are as follows: 1, when people are emotionally excited, the cerebral cortex is in a state of sustained excitement is not sleepy, pay attention to adjusting emotions can listen to soothing music or write to divert attention, so that they are calm. 2, too much sleep during the day can also lead to, when the brain gets a long rest after a long time to get a good rest will be in a state of sustained excitement, and will not produce sleepy. 3, the usual high work pressure, mental stress, resulting in the whole body is in a state of tension, then the whole body is in a state of tension. The whole body is in a state of tension, it is easy to have no sleep, usually pay attention to regulation, long time to go on easy to lead to insomnia, tiredness, anxiety, depression, etc. 4, hyperthyroidism, patients with hyperactivity, irritability, check the thyroid function can be diagnosed, and need to be actively treated. 5, cerebrovascular disease, especially the occurrence of frontal lobe of the cerebral hemorrhage or cerebral infarction, easy to lead to mental hyperactivity, no sleep, and need to actively treat the primary disease. 6, sleep, the brain will not have any sleep, it is easy to have a sleep. 6, drink easy to excite the coffee or strong tea before going to bed will also have no sleepiness, usually to avoid, to prevent the impact of the next day’s work.