I have a 3 1/2 year old boy who has been toilet trained for a little under a year. But still has a very wet nappy of a night. We have limited his fluids after 6pm and he goes to the toilet bewfore he goes to bed, but this has not help.

Do not stress, many children, especially boys, can still be in night nappies until after the age of 4. They say not to worry until the age of 6 and then seek help if they are still wetting the bed. I also wouldn't be too worried about limiting fluids, both my boys have large water bottles next to the bed, I only moniter what fluids they have as I have heard that sugary drinks are the worst. Things like 'diet coke' can act as a diuretic so I avoid these. Like most things with kids, they won't do anything until THEY are ready.

My nearly 3 1/2 yr old did really well going to bed with no nappy on for the first 3 months without wetting the bed once. Now I have put him into nappies again because he started wetting the bed- 3 nights in a row, that was when I decided he was going into nappies at night again. Every now and then we will try a night without one and often he does real good, but other times he slips back again. He also has a drink and toilet b4 bed but still eventually slips back again.
He knows he won't get into trouble if he does it I reassure him I'd rather him go to bed without a nappy, it's just in the morning when he won't take the nappy off and go to the toilet, he keeps it on and still wets the nappy.