I too struggle with nonfiction but want to force myself to read some, here is what I do:
1) Nonfiction works much better for me in the car. I'm trapped and audiobooks are a great way to read (some) nonfiction. Some books may not work but many will.
2) Try NF with humor in it or that is written in a non-formal way. That works best for me. I don't want to read a textbook (with very few exceptions.)
3) Try going to your home screen whenever you are done with a reading session. That way you don't start right where you were in your fiction book and (might) choose a NF title.
Here are some that I've enjoyed:
- Matt Parker has some good mathematics type books. (Standup Maths and a frequent Numberphile contributor on Youtube.)
- Mary Roach has some good science books on various "disturbing" topics. Very fun and you'll learn something.
- Jenny Lawson (the Bloggess) has a couple good books dealing with various topics.
- Bill Hammack's "Fatal Flight" is good (and available as an audio book or podcast for free.)
- There are a lot of good history books out there that are accessible. I really enjoyed The Devil in the White City for example.