I take medications but they aren't enough. The best non-medication remedy I have to go to sleep, or go back to sleep if I wake up, is to listen to music in total darkness (through headphones while in bed). It seems important to be totally dark, and the music helps my thoughts slow down. Reading doesn't work for me because it stimulates thinking too much.

Another option is listening to a Buddhist teacher giving a talk. They have soothing voices and often speak in a way that engenders calm.

If you are looking at a computer or sitting in bright light late at night, and you have no choice about this, you could try wearing blue-blocker sunglasses or turning down the blue on your monitor (if it has individual color adjustments).

Mike