Hi bananagirl! I wet the bed a few months ago and I have no idea why. I'm 27 and haven't done that since probably I was 3 or 4 and even then I only remember it happening a couple times. I don't know why it happened to me, but it hasn't happened since. I dreamnt I was peeing and woke up and the bed was wet. I was really weirded out/embarrassed after it happened. I'm not on 6-mp though, but you could bring it up to your doctor, especially if it happens again.
After it happened to me, I Google searched "adult bedwetting" (lol) and it seems fairly common for this to happen once or twice to healthy adults. But definitely tell your doc. since you seem to be having other symptoms (increased need to urination during the day).