I've started going for a long walk before I start working, and I've since found it much easier to dive into work before "just checking out this one article". I think it's because I feel like I've already had a part of my day devoted to something that's just for me, so I don't feel like my day is belongs to someone else's goals from the get go. That, and I'm more awake, which makes it easier to think about complex tasks.