Sleep behavior in dogs is still not a highly developed field, but experts do have some ideas as to why your dog touches you when they are sleeping. One of the most likely reasons is that your dog simply likes cuddling with you! You are special to them and they want to be close to you at all times. It is their way of expressing their love for you. They also see you as their protector, their pack leader, that's why they naturally gravitate towards you.