Oh! And I meant to add that in recent years my favourite way to fall asleep has been listening to audiobooks; something about the sound of someone reading to me is better than music or nothing or even the kind of white-noise or rain-on-car-roof things I've used before. I use the Audible app and the 15-minute sleep timer and usually I fall asleep well before the 15 minutes is up, and have to adjust the position back the next day. I've worked my way in tiny increments through the entire Ancillary trilogy twice and am currently working through All Systems Red the same way.