I never did this with my kids but we had sleepovers probably once a week. Everything worked out fine and they are good sleepers. A friend did frequent sleeping with her kid and it turned into a dependency. The kid was 8 and still wanting it so it impacted friend sleepovers and when the parent went to bed. I think everything in moderation. It is a good way to bond but you want your child to be able to self soothe.