DS is 3 1/2 and is in the habit of drinking water at night - he'll come out and ask for some if his cup is empty. About half of the time he'll come to us in the night and say he wants a wee, but even then his nappy will be quite heavy in the morning.
I guess as a start we have to take the water away from him don't we...? Are there any other tips for night-time potty training? He's been sorted in the day for ages now.