It's a time to be close to each other and to God. There are many ways to talk to children about God at bedtime. As was said, we do this primarily by the way we put them to bed. We do this by mustering patience as our own busy day comes to an end. But, we can also do it with stories.
Children love stories, stories, stories.
In our family there is one type of story which is the regular, nightly request. This has been going on so long that I am running dry of stories, or so it seems. I have overheard her telling these stories to her little friends as they played in her room. As I get older I am beginning to appreciate this form of story more. It tells of heritage, of lineage, of roots.