That happens. Doesn't mean you need diapers or anything. I was 16 when I had a similar dream and woke up in the process of wetting the bed. It was awfully humiliating, and I had to remove the evidence before my parents found out. But it's only happened once. And someone tickling you can make you wet yourself, it can happen to anyone. It's embarassing for the moment, but eventually people will get over it. And everyone, I mean everyone, has an accident after they're supposedly too old to. Best way to avoid it is to find a bathroom the minute you know you've got to, instead of waiting. Also, go before bed. If accidents happen frequently, there may be a medical problem, which should be checked out ASAP. But if it's a couple of isolated incidents, like the dream only happened once and the tickling incident was when you *really* had to go to begin with, then it's perfectly normal.