Sudden bedwetting may be caused by overwork, mental factors, urinary tract infection and other reasons. 1. Overwork: If you drink too much water before going to bed, and if you have recently been overworked and are in a deep sleep, and if you have the urge to urinate and are not easily awakened, it may lead to sudden bedwetting. 2. Mental factors: If you are frightened in your daily life and are in a state of high mental concentration, you may experience sudden bedwetting in your sleep. 3. Urinary tract infection: If the patient has an infection in the urinary tract, the inflammatory cells stimulate the urethra and bladder, which may cause frequent urination, urinary urgency and urge incontinence, thus leading to sudden bedwetting. If this phenomenon occurs frequently, should promptly go to the regular hospital to identify the cause of the disease, under the guidance of professional doctors to take targeted treatment measures.