Semen production goes on in the testis for 24 hours and gets stored in seminal vesicles. Now imagine seminal vesicles as a water tank. 24 hours production at some time, will make tank full. Its storage capacity runs out. Now overflowing mechanisms take place like night falls and seminal discharge in urine. To avoid this u need to have sex or masturbate regularly.

Hi, Night fall or wet dreams is a very common occurrence among men,  This condition is characterized by involuntary ejaculation during sleep in the night or in the early hours of the morning.  avoid consumption of any liquid for at least 2 hours before going to sleep. Kegel exercise helps control Night Fall. avoid constipation because an upset digestive system also sometimes causes night fall. Exercising regularly and avoiding spicy foods can lessen the frequency of nightfall.