- The Harry Potter Books
- Divergent
- The Stand
- The Martian
- Fatherland
- Watership Down
- The Girl With All the Gifts
- Infected
Now many of those books, will have pretty heavy content storywise, but they are very dialogue centric and great easy reads, while still being awesome.
The only issue you may run into with using any of them to fall asleep is you may find to be “page turners” so you may not want to stop reading.