[Uroboric]

What finally worked for me is listening to history audio books/lectures.

It takes my mind off of real life things, and since it's just audio there is no light involved. History is perfect because there aren't many conceptual hurdles to understanding the material that would require really intense focus. I start to drift off after 30 minutes to 1.5 hours very consistently. It's also easy to find new listening material since there's practically an infinite amount of it.

As a bonus, I've learned a lot about history this way.