Lead Baby

I found that Victor and I both rub our feet together as we get cozy to fall asleep -- and now I've found a new thing -- that he and my brother share. Falling back into bed. As a boy, my brother would love to sit up in bed and then fall back into it. He would do this over and over again -- as an excited relaxation method. Victor has discovered this tonight. He would fall back and look up at the ceiling fan for a little bit, and then sit up & do it again. After a few minutes, he realized he could stand up and fall backwards too. Is this a genetic thing? Were our ancestors doing this same pre-bed ritual?