Never Nightmares.
My happy thought is always changing. It's the scene that puts me to sleep. The one where I've have the characters in a room talking to each other, the climax where all the emotions have run them ragged and its resolution time. Or perhaps, an action see, where they are moving in slow motion, allowing me to see just the word needed to explain it perfectly. Perhaps, still, it might be what makes the scene heart breaking, the tie no one thought would be strained, come to an unexpected head. These scenes are the ones I go to sleep to, the ones that lull me into a deep slumper so that when I wake up, I have to turn my computer on to grasp them on paper (or digital format, as would be the case most of the time). I use my dreams as my creative canvas, an in this manner of sleep, I never have nightmares. My sleep, my scene, is my happy thought.