Maladaptive Daydreaming: where wild minds come to rest
I tried this a few years ago, and it worked at first, but eventually backfired on me. The journal ended up being filled with stories/reflections/drawings all about my daydreams, and it quickly became a trigger for me and made me want to daydream even more.
So I guess as long as you write about things other than daydreaming, I think it could be a really helpful distraction.
I've been keeping that in mind. Not only because I don't want to make the journal a trigger but also I keep my journal with me everywhere and my friends tend to be...nosy. So I definitely will not write my daydreams, but why I want to daydream at that moment.
I never tried that but I can see how it would work. It creates some distance between the daydream and you and helps you unplug a bit.