Basically, the overworld you move around routes through nodes and most of them will either have you draw a Fate card (which will either do something then and there or populate part of the Slumber dreamscape map) or a Slumber card (which will most likely be an Entity you have to encounter in the Slumber dreamscape). It’s kind of interesting in that Slumber takes place in a map that’s being built as you go on the overworld that stays fixed until you enter a Dream proper, and your position is saved, etc. And Fates will introduce Quirks that will complicate things for you. But on the other hand, so far it’s just a straight up fight with a monster and to start with there’s only one monster and it’s not very hard to deal with as a solo player. And you may or may not get anything worthwhile out of it (rewards are based on the Turn card you end the encounter on). It’s pretty quick stuff, though, and since you don’t reset your hand, passive Progress cards, items, sealed cards, etc when Slumbers end you can use it to do some prep you don’t really have time for in the main Dreams. I think it might be interesting in the longer term, it’s just kind of bare bones when it first comes into play. And I’ve only gotten as far as starting a second Dream, so.