I know you mentioned audiobooks but what about some digital books? Personally, reading makes my eyes tired so I know that, for me, reading something would be a good way to provoke a nap.
As a response to the idea that you may get fatigued by passive media, a book may be a good balance to that. With movies, shows, and audiobooks, you’re going to be listening the whole time. It’s just constant noise. A book may be more meditative.
Which reminds me, this may be a good time to practice meditation.