I actually physpically can't get to sleep without music... every day at home since the age of about 7 I've had my hifi on a one hour sleep timer. I think it's just something I've conditioned myself into and a habit I rather enjoy and don't want to break.

And to answer your question I sum up my day in my mind and then lock it away and just relax. Nothing beats a quick bedtime spliff if I'm anxious about the following day.