Progress/ Resistence

When I first received and started to read the Heirloom Package One I was very excite and could not wait to have time to read it and anxiously awaited for the second package. Unfortunately, half way through the second heirloom package shortly after I would start my reading a level of fatigue would come upon me that would really interfere with my learning. I am persisting but it is taking a longer time. I am only partially though the Third Heirloom Package. Do you have any suggestions?
Deanna