Whenever I got close to her, she would wake up. At night she always sleeps on my bed, and tries to dig up the covers and make a hole for her bed. She woudl get he covers in her mouth and pull them until she was satisfied that she had made a good bed. I think that dogs are very picky about where they lie down. Everything has to be just right.
Dogs are also light sleepers.
I think that dogs have good hearing, and that they are usually very alert. They are natural guards. Day 5 I observed Lady looking for sunshine reflecting on the ground, and then lying down when she found it. When I opened the back door, she woudl awake very easily. Short-haired dogs, like Lady, don't like the cold.