Usually, when my kids sleep with me, after they fall asleep, I whisper affirmations into their ears, like "We love you very much. You are strong. You are smart. You are amazing. You can do anything. We are always here for you."
My boy was sleeping with me last night and although he was fast asleep, he shook his head "no" both times when I whispered, "You are strong. You are smart."
The lack of self-confidence of these kids runs right to their core. I will start doing the affirmations every night, I think.