Lately, I've been telling myself "Deep sleep, healing dreams" a few times before I go to sleep. I don't know if there are other effects, but I do feel more rested when I wake up.
I don't usually remember my dreams, and it occurred to me that I might want to find out what's going on in those dreams, and possibly in other parts of my life, so I changed it to "Deep sleep, healing dreams, remember, remember, remember".
This morning, I remembered a dream of being at a butcher shop, while a small animal (a dog?) was being cut up, and the thought was something like "If you don't react emotionally, it's easier for me to not get involved."