Waking a child up in the middle of the night to get him to the toilet will delay the outgrowing process. It's important to let him sleep soundly at night and develop a proper sleep rhythm, so that the body can release the nocturnal antidiuretic hormones*1 . Waking him up in the middle of the night will simply cause his condition to deteriorate.
It may not be the same for everyone, but if you give him too much fluids before sleep during the period when there are insufficient antidiuretic hormones*1 being released , there's a possibility he may wet the bed because his bladder is unable to hold the pee produced.
However, withholding water from him when he is thirsty so as to prevent him from wetting the bed is not a good idea either. Let him drink if he wants to. In fact, do try to approach this matter with the attitude that it shouldn't matter if he wets his bed, while making necessary preparations should it happen.
Also, he'll want to drink plenty of water if he is often fed high-salt foods, so do let him get into the habit of eating less savoury foods.
Don't worry! Making him wear diapers or bedwetting pants won't prolong the outgrowing process.
To help him outgrow bedwetting, it's important that you help your child in his development by letting him sleep soundly through the night. Also, wait for the antidiuretic hormones*1 secretion to get on track. Rather than allowing the wetness to interrupt his sleep, give him bedwetting pants and let him sleep tight. You can also use pants diapers if you like, but once he is 3 years old, his pee during the night increases in speed and volume. Bedwetting pants are specially designed with this in mind, to enable your child to sleep better.
*1 - Antidiuretic hormones
The hormones are released from a part of the brain called the pituitary gland, and it regulates pee volume. When your child is fast asleep, a large amount is released, signalling the kidneys to work at thickening the pee being produced, thus reducing the volume. As the child's sleep rhythm progresses into a grown-up's, he will start producing a huge amount of antidiuretic hormones during the night. As a result, his pee volume decreases when he is sleeping at night.
Maternity & Gynaecological Clinic
820 Thomson Road, Mount Alvernia Medical Centre, Block A #B1-01, Singapore 574623