my kids all have a drink before bed if they want it, and we get them to pee (or try to

) before going to bed too. Lukey occasionally has a wet bed if he's really tired and hasn't been to the toilet before going to bed (he's 5 1/2) but Ben seems to have a bladder of steel! He was night dry for at least 12mths or more before he was day trained, I was just too chicken to put him to bed without the nappy!