The reason for waking up in the middle of the night: 1, related to psycho-psychological factors, people in a situation of mental stress, anxiety, worry, work, fear and other psychological factors can lead to sudden awakening in the middle of the night when sleeping. This situation is more common in life and can be alleviated through self-regulation. 2, waking up in the middle of the night may be related to environmental factors, such as the environment due to noise, noise or due to the cold environment and other stimuli will make people wake up in the middle of the night. 3, waking up in the middle of the night may be caused by a disease, such as some people suffering from painful diseases, due to stimulation will wake up in the middle of the night. 4, part of 5, waking up in the middle of the night if there is no physical abnormalities, or psychological factors, may be too much sleep during the day and not too sleepy at night. For example, some people sleep more than 2-3 hours during the day, which is a very light sleep at night and easy to wake up in the middle of the night.