Often while reading a paper, I will see a citation that that seems more relevant than my current one. I'll switch to the new paper, only to experience a similar feeling. Or maybe I need to look something up on Wikipedia. An hour later, I'll still feel as if I didn't really digest anything. I will have skimmed 2-4 papers' introductions and conclusions, scratched some notes on the side, and generally feel overwhelmed.
Is this a bad habit? An abnormal feeling? How have others dealt with this to become more productive readers?