A.S.
My son has done the same thing for years off and on. (He is 12 now).It was totally my fault. I snuggled with him and I shouldn't. When I stopped snuggling was when he would rather sleep in his own bed. Once he falls asleep, try putting him in his own bed. When my son was a little older, he said that mommy had daddy, his sisiters had each other, and he didin't have anyone. Made me more lienient. Probably too. I know it's hard because they are small for such a short time. Good luck.