Recently, I have been having these unexplainable orgasms. I lie down on my back to go to sleep and I start to get these muscle spasms throughout my legs, in defferent areas. Then I feel my prostate spasm every so often and I am totally hard, with precum dripping out. Sometimes it is so intense that I feel like I am going to cum if I let myself. This whole thing lasts about 20-25 minuts and then my whole body begins to tremble for sometimes as long as 4-5 minutes but I do not actually cum. It is the most amazing thing but I do not know what is causing them? Is this a common thing??? Not that I am complaining.