David Michael writes in "A Father's Guide to Blessing His Children," a booklet available from Children Desiring God:
Although blessing his wife and children will not make a man a godly leader, I have found it to be a place where many men can begin. The discipline of blessing his children at bedtime can begin to give a man a sense that he is doing something spiritually significant for his children. It helps him to feel more like a leader and thus more likely to embrace the wider responsibility for the spiritual encouragement of his wife and children. It helps build confidence when he sees God work through such a simple thing...(p. 13)The booklet comes with two sets of blessing cards (12 per set) which have Scripture verses written in the form of spoken blessings.
...Since I first began blessing my daughters I have had a vision of a night, 160 years from now. I imagine a young man kneeling beside his child's bed, pronouncing the same blessing that his great great great gandfather Michael pronounced over his great great grandma. This is more than a sentimental desire. it is rooted in an earnest prayer that a river of faith will flow through my descendents and that all of them will fear the Lord. (p. 17)