We're well into the 21st century, so embrace technology and use it to further your knowledge on art history. Online learning via your laptop, tablet, or smartphone is about as easy as it gets. You can take a course or learn something whenever and wherever it's most convenient for you.
There are all kinds of courses/lectures available--on art history, on art movements and eras, as well as on individual artists, painters, and even particular paintings.
They are available FREE and online at such sites as:
Don't forget about the Art Babble site either, http://www.artbabble.org/ .
When you need to take a break from your actual painting, use that time to become better educated about your avocation and how it evolved.