I know exactly how Tim feels. It’s hard not to feel guilty when you’re reading something instead of spending the time doing “real work”, but it always ends up being time well spent:
Reading time can be hard to justify, even to oneself. There is no deadline. It’s not going to move any immediate projects forward (most likely). And it often feels like a waste of time, especially if your interests are diverse. But it’s important. Most great work is the product of collaborative thinking.