I'm not sure where I first became aware of the historical ritual of formally "blessing" one's children each night before bed. I'd like to say it was a scholarly book, but it may have been an episode of The Tudors. At any rate, something about the general idea--if not the stiffness of the way it was practiced in the 1500's, et al.--stuck in my head, and I do it almost every night after the kids are asleep.
It's a dangerous habit, to be sure--tip-toeing into their dark room, gently laying a hand on their respective heads--but I've never woken either of them yet, so I guess I'm beating the odds.
And even if I did wake one of them up now and then, it would be worth it. That three seconds of touching their sweet, sweaty heads. Transmitting all that I love and hope for and would kill to protect into their sleeping brains. It doesn't convert to words very well, but I believe that somewhere in their subconscious they must feel it, like beams of warm sunlight coming out of my fingertips.