I know that feeling all too well. My solution when I was still taking classes was to do it in ten minute increments with a timer set so I wouldn't go over and then a ten minute break to do whatever I wanted (healthy options of course). that way I felt like I was accomplishing something and at the same time I wasn't being overwhelmed with information. I'd also take notes while I read so I could reread them after each section was over. It worked for me, maybe you could try it.