As others have said, take notes. The same thing happens to me and I find I can't get rid of the "itch" of a new idea without writing it down. Once you write i

As others have said, take notes. The same thing happens to me and I find I can't get rid of the "itch" of a new idea without writing it down. Once you write it down you can easily continue reading. Revisit your notes later and explore the ideas.