Hi, my penis gets erected during night while sleeping without any sexual thoughts or feelings. My penis will also get erect if I sleep in daytime. The erection will come down after awakening from sleep or passing urine. I get up 3 times for passing the urine. 6 months before, I had undergone abdominal scanning, it showed that my gall bladder is slightly distended (recently I was in medication for hydrocephalus. Tablets taken: valparin chrono, oxetol. Now these medicines have been stopped after hydrocephalus surgery.) please tell me what could be the problem.