T.R.
I agree with Deborah below. Pray with your son before he goes to bed, make it part of your night routine. Is he going to bed at the same time? That is important also! Read him a short book, let him pick it out.
Pray with him and tuck him into bed. I have an almost 13 yr old who still loves for me to tuck him into bed! He loves for me to pray with him, cuddle him, kiss him and cover him up. Besure and tell him you love him just before you turn off the light! Prayer is vital.