I just finished watching a Las Vegas episode in which Danny went off as a Marine and came back from combat. He was unable to sleep or wouldn’t sleep when he had come back. It turned out that all of his unit had been killed and there was no one to watch his back. When he asked his mentor if he had had to do what he did, then he fell asleep when he heard yes.
Sometimes, I feel like I really don’t have anyone to watch my back. And I don’t sleep well.