Waking up just after falling asleep may be caused by factors such as sleep habits, psychological factors and physical diseases, as follows: 1. Sleeping habits: if you sleep too long during the day and have a light sleep at night, you will be prone to awakening in sleep; 2. Psychological factors: excessive mental stress, anxiety, depression, leading to too much thinking before going to bed, which in turn affects the quality of sleep; 3. somatic diseases: some somatic diseases can also affect sleep, such as hyperthyroidism. It should be noted that, just fall asleep will wake up there may be other reasons, such as often take stimulating food and drugs, it is recommended that patients go to the hospital to check the cause of the disease to give targeted treatment.