Alright I have experienced this all my life but I figured I would ask to see if anyone else has this problem. After I have sex or masterbate it is guaranteed that I will get an erection for the next 3-4 days everytime I lay down to go to bed. And it lasts until I fall asleep and I have one in the morning when I wake up. For all I know I have one all night long. After about 4 days if I don't do anything it will normally quit happening. Just wondering if i'm the only one cuz it gets kinda annoying when your trying to fall asleep with a raging hardon!