When I was younger, I would listen to classical music as I went to sleep because it didn't have any words to grab my attention. My thoughts would sync, then fall silent, allowing me to fall asleep as I pictured many strings, wires, bells, or horns vibrating to create those sounds. At my most restless, I would picture something floating in the sky, then meticulously make my way around it (rather than stay still & rotate it). Now I listen to
Astronomy Cast when I fall asleep because I get way better visuals to dream up.
Sorry if that sounded like an infomercial.