My DS is 6 1/2. Since being out of nappies at night he has sporadically wet the bed.
He seems to recently be getting worse at how often it happens - we do the usual limiting drinks before bedtime, last wee before bed, nightlight so he can go if he needs to overnight etc.
The wetting itself is sort of not the problem (though becoming irritating as he sleeps on a top bunk so bed changing is a bloody nightmare!) it's the fact that he lies about having done it. He will get dressed when he gets up in the morning and I then find a stinky wet bed once he has gone to school! I am mortified that he goes off to school smelling of piss!
We're very clear with him that we are not cross about the wetting but very cross when he hides it. But still it continues... sometimes you discover it has been wet when you're putting him to bed back in it! 
I think he is dreaming that he goes to the toilet as he swears he gets up to go - I used to have similar dreams and wet beds when I was a kid.
I am just pissed off now! Do I just keep getting angry when it happens?!