Sleeping at night and laughing occasionally occurs is generally considered a normal physiological phenomenon, may be in the dream state encountered in their own very happy things, or the sleep environment is very comfortable, so that the body is very relaxed, so that during sleep may appear to smile, or laugh out loud. In addition, it is also possible that watching funny videos before going to bed causes the cerebral cortex to be more excited, this is generally not too much to worry about. However, if you sleep for a long time, you need to be alert to the possibility of neurosis or intracranial organic lesions, which may cause neurasthenia, plant nerve disorders, etc. It is recommended to go to the neurology department in a timely manner, under the guidance of the doctor to use symptomatic drugs to actively treat and observe the improvement of symptoms. In normal life, pay attention to maintain good habits, do not stay up late, maintain an optimistic state of mind, before going to bed can listen to some light music, foot bath, drink milk to promote sleep, do not drink strong tea, coffee and other stimulating and exciting substances, so as not to affect the sleep.