Lately, I have been so stressed and spinning, that I talk myself to sleep by repeating the serenity prayer over, and over, and over, and over. Sometimes I add in a few rounds repeating the 12 steps, too, but mostly, it's just the serenity prayer.
Grant me the courage to accept the things I cannot change (other people, my past), the courage to change the things I can (how I react to others, how I deal with my past experiences), and the wisdom to know the difference (which is what my T is there to help with!)