Sitting up unconsciously in bed at night may be related to sleepwalking or dreaming. It may be related to decreased sleep quality due to mental stress, excessive tension, anxiety, or neurasthenia. The symptoms may be caused by sudden sitting up or unconscious activities during sleep, but after waking up, the symptoms are often not remembered. The cause may also be related to high room temperature and excessive sweating. Occasional sitting up may also occur after playing computer games, watching comedy movies, or doing strenuous exercise for a long time before going to bed. With heart or lung disease, it is possible to wake up during sleep with symptoms such as sudden sitting up and sitting down to breathe. The specific cause of the symptoms should be analyzed and judged in conjunction with the accompanying symptoms, and it is often necessary to go to the neurology department of the hospital for further examination to clarify the specific cause.