Reading Block

So I've heard of writers block, but is there such a thing as readers block? I am still reading but not as much as I normally would. I have 3 books that I am reading right now, and one of them I am literally almost done with. I have half a chapter left. Usually when this happens I cant put the books down till it's done. The next one I am more than half way through. I just don't understand it. Has anyone out there had a similar experience?