A flat lie on the want to urinate can not sleep may be physiological factors, may also be the manifestation of certain diseases, such as cystitis, prostatitis, prostate hyperplasia, etc., should be timely medical examination to check the cause of the disease. 1. Physiological factors: If you drink too much water before bed, eat fruits with high water content, or have a high level of mental stress, you may have the symptom of wanting to urinate once you sleep in bed. 2. Pathologic factors: (1) cystitis: mostly due to bacterial infection, radiation damage, etc., usually associated with long-term urinary holding, unclean sex and lead to bacteria through the neighboring urethra into the bladder and other reasons, manifested in frequent urination, urinary urgency, urinary pain and other symptoms, which appeared as soon as the phenomenon of wanting to urinate in bed. (2) prostatitis: mostly due to bacterial infection, usually and long-term smoking, alcoholism, unclean sex and other bad habits, manifested in frequent urination, urinary urgency, urinary pain, sexual dysfunction and other manifestations, so that the phenomenon of wanting to urinate when sleeping in bed. (3) Prostatic hyperplasia: unstable androgen levels may lead to prostatic hyperplasia, which manifests itself in symptoms such as urinary urgency, increased nocturia, and difficulty in urination, resulting in the phenomenon of wanting to urinate as soon as one sleeps in bed. This symptom may also be caused by other factors, it is recommended that patients go to the regular hospital as soon as possible to check by the doctor to clarify the cause of the disease, give targeted treatment, and strive for early recovery.