Most mornings, Mary makes her way into our bed between 5 and 6 am. Sometimes she goes back to sleep, sometimes not.
Some mornings, like this morning, she comes in much, much earlier. I don’t kow what time she came in, but around 430 am, Fritz came in because he had heard screaming outside. Bill got him back into bed and assured him he likely heard a possum and/or cats fighting.
When he came back to our bed, he commented on Mary’s ragged snoring, which I was desperately trying to ignore. I scooped her up to take her back to her bed.
“Oh, no, she’s fine,” he said. He hadn’t meant for me to have to get up.
“No, she’s driving me crazy,” I said.
I carried the girl, still snoring, back into her room. As I gently set her down, her eyes opened.
“No,” she begged, “I won’t drive you crazy, Mom.”
I smiled, kissed her, and then took her hand and led her back to our room.
Reit This Way 
You couldn't resist that, could you?
Our daughter went through a period of coming into our bed every night (at various times) when she was about 7 or 8. It was every night, she had a bad dream or couldn't get back to sleep.
We tried to get her back to bed, but usually that woke us up more than just letting her settle in. She's little and we have a king size bed, so there was room.
There's something about that sweet face sleeping….
Then just as we were really trying to figure out how to stop it — she stopped — all of a sudden and completely. I think it was a phase she was going through and she hasn't done it since. It went from E.V.E.R.Y. night, to not at all. Now (she's 10), even if she wakes up early in the morning, she pulls out a book or toys and plays.
Reading your post made me just a little wistful for that sweet sleeping face in my bed in the morning!
Hahaha!
Little Brother often falls asleep on the couch in the living room, over his book. When I lead him upstairs and cover him up in his bed, he's asleep–but he YAWNS. In his sleep. Always makes me laugh.