I had the same problem. I've been doing 100% audiobooks for several years now and I'll never go back. I can work through a regular length book in a week w/ retention on par with regular book reading.

Yeah, I feel you. Used to read a huge amount. Found myself zoning out and reaching for my phone to check (ironically) HN, or my email. Solved by turning my phone off and leaving it in another room. Checking it becomes more effort than not checking it - habit quickly broken.