For some it's possible, for others it's probably not. I can just say what worked for me. I think there are two keys to my success at becoming a bedwetter. One, when I do pee need to pee even at night on the rare occasion when I wake up and need to pee, I don't force it. I just focus on relaxing and soon enough the flow will start. I think the push to pee is detrimental to actually peeing while asleep. The second key is trying to time when your "accidents" happen to when you are still very sleepy. I normally go to sleep about 11 and wake up at 6. If I am desperate to pee when I go to sleep, then it's hard to get to sleep or I wake up before I am in a deep sleep. On the other hand, If I have to pee at 5:00, by then I'm out of the deep sleep phase, and it's very hard to get back to sleep. For me, I try to be well hydrated, with a somewhat empty bladder. I pee about 9:00 at night, and continue to drink lots of water, maybe a mixed drink. So usually my bladder fills and needs to be releases by 1-2 am. That way I'm still in the deepest sleep cycle and didn't have problems getting back to sleep. BTW you will have daytime accidents as well. I laid down for a nap two weeks ago, without a diaper and woke up soaked. OK, I had just walked 18 holes and drank a couple of beers, but it was completely unexpected. I'm not saying I wouldn't do it again, but once you pee in your sleep, that can happen anytime.It’s impossible for the most part. People here will tell you “just go when you feel the need and eventually” but that is a load of shit. Things very rarely work that way with the subconscious mind.