Many audio-book apps have a sleep timer feature, so you don't have to worry about the book playing the whole night if you fall asleep in the meanwhile.
https://www.dropbox.com/s/opaoujvykzxxtzo/Eckhart%20Tolle%20...
This is the track if any are interested. I find the content engages my mind but is relaxing, it is easy to slip into sleep.
Many audio-book apps have a sleep timer feature, so you don't have to worry about the book playing the whole night if you fall asleep in the meanwhile.