Causes of brain arousal. When there are some reasons, such as plant nerve dysfunction, or some diseases, can lead to abnormal metabolism of transmitters in the brain, especially the increase of 5-hydroxytryptamine metabolism, people can appear brain excitement, manifested as less sleep or difficulty in sleeping. For this situation, you can take some oral drugs to improve the metabolism of the brain transmitters. Generally, clinically commonly used are Dextran, Prozac, escitalopram oxalate, and also with drugs that improve brain nerve function, such as cytarabine sodium, oracetam, etc. Secondly, the cause of brain excitement, consider and eat food or drugs related to the current clinical more can cause brain excitement is caffeine, mainly in food coffee or some drugs also contain this caffeine, such as go to the pain tablets, brain clear tablets, etc., have this caffeine. Caffeine can act on the central nervous system, can cause brain excitement, people generally feel more full of energy after taking this, full of strength.