Sudden bedwetting 1 time in women at the age of 20 may be a result of extreme mental stress, excessive and too deep sleep, bladder urge to urinate, and the formation of bladder reflex after the patient cannot be awakened for effective urination due to too deep sleep. It should also be noted that men or women who generally urinate outside of normal urination basically do not experience unconscious urination during sleep, and if it occurs once in a while, it may not be a major problem; if it occurs 3-4 times a month, one must pay attention to whether it is a pathological factor such as neurogenic bladder infection or posterior urethral valve disease. It must be differentiated from acute urinary incontinence, and in women, attention should be paid to ectopic ureteral openings.