I've experienced the same with routine tasks such as showering or going for a run. I'll often put on a podcast or audiobook, but if I don't find myself actively focusing on the narrative, the daydream will be "louder" than what I'm listening to. I find I can go almost an hour with background noise I never heard before realizing I completely lost my place.

This phenomenon does not occur if I'm reading a physical piece of media, like a book.