That's a question you will have to work out for yourself. Every one is different and what works for one person may not work for another. How much protection your son needs will depend on how much and how many times he wets during the night. You could try Goodnights and if that doesn't work then move up to something more absorbent like Depends overnight. The really absorbent diapers, like Tena and Molicare, are available only through mail order and are a bit expensive. You can also use inserts inside a diaper for extra absorbency. If nothing else works, cloth diapers and plastic pants are the most absorbent combination you will find.