Stress could play a role in adult bedwetting. The dream might have something to do with it too. Did you have the same dream when it happened again?

Also, you could have some sort of infection or maybe there's something wrong with your prostate. Prostate problems, such as enlarged prostate or prostate cancer, usually occur around your age. Of course this doesn't apply to every man, but if you're very worried and this happens again, you might have no choice but to see a doctor.

Source: http://www.nationalincontinence.com/s/common-reasons-for-mens-incontinence

Stress can play a role but is usually not the only cause in and of itself. When you were younger (as in childhood or adolescence, but old enough that you would have expected most of your peers to be dry overnight) did you ever have an occasional of chronic bedwetting problem? In cases like that, extreme stress can cause the body to revert to what is in essence the "default" pattern for your body at one time even if it was many, many years ago. In the absence of any such history, it's likely that something about your system has changed to allow this to happen now when it hasn't before - which could be your bladder muscles, nerves, prostate, metabolism or a number of other things. Early onset diabetes can sometimes cause excessive urination, so if that hasn't been ruled out it probably should be also. I completely understand about the difficulty of affording doctor visits, but possibly there's a free or low-cost clinic you could visit that could do at least some basic tests to rule things out?

Thanks for your replies. I did not have an issue with this past age 6 or so.

As I stated above, I was in a panic when I posted here. I think perhaps it was just sheer exhaustion that kept me from waking up when my bladder was full. It has not happened again.

Glad it hasn't happened again. Being completely exhausted can certainly play a role in it as well. I had problems with it all through childhood and even into young adulthood, and while I pretty much don't anymore, a few weeks ago I was just totally exhausted on one particular night and it happened again. Wash sheets, move on, no big deal.

It's true that almost any of the possible underlying causes we mentioned (diabetes, kidney problems, prostate, etc.) will almost certainly have other symptoms besides bedwetting, if any of them is really going on. So if this only happens to you sporadically (even if it were to happen again a handful of times in the future) and you otherwise feel healthy and have no other symptoms, there's probably no need to go to the doctor for just this. Going to the doctor can help calm you down if you're feeling excessively panicked at any point, though. :)