The waiting blanket.
One morning, probably about a year ago, she announced, "Mom, you didn't come check on me last night. I know because you didn't put my waiting blanket on me and I was cold."
"I'm sorry, K. I fell right to sleep. I try to come in each and every night. I have missed very few nights. But, I have to ask. What is a waiting blanket?"
She explained that she puts half of her blankets on and leaves a blanket for me to tuck her in with. If the blanket hasn't been put on her, she knows I wasn't there.
Pretty smart. :)
I know that it will happen one day, but I hope that she doesn't grow out of the waiting blanket anytime soon.