This is called hyperfocusing (AKA the zone) and it's a typical characteristic of people with ADD. I have it pretty bad and I almost flunked out of school because I would spend all day reading enormous serial fantasy novels (wheel of time FTW!).
Another recommendation would be Brandon Sanderson's Cosmere multi-series (Mistborn, Stormlight Archive), currently in progress, closer to WoT thematically.