All my life, I've endeavored to mark my place in a book and set it down, just after turning the page. When I continue, which might be minutes or months later, I turn to the bookmark and know exactly where to begin reading again. But what happens, I finally asked myself, if I don't clearly remember the current context? Because then I must turn back one page and take a quick glance to remind myself what's happening.
My new habit, that I assure you I will learn with some considerable pain, is to leave off reading and bookmark the book when I'm at the top of the RIGHTHAND page. That way, when I continue, the context will lie before me, plain to see on the left.