Whenever LL and I go to sleep together, she is ALWAYS in my arms. Neither of us move much. I used to toss and turn all night, but since she is there, I stay put. I have noticed that she sleeps a lot better too when she is in my arms, no matter where it might be. If we are in the living room watching something on TV and I'm holding her, she will just drift off to sleep. I will ask her at the end of the ep/movie if she wants to do something else, and the response that I almost always get is "I'm in my happy place right now". It warms my heart. I'm no doctor by any means, but I think the basic human contact with someone you love along with the trust that you will watch over them as they sleep, might be a lot of the reason that person can get the sleep that their body needs, and they are trusting you to be their keeper.