A lot of the time, I start work on a project just to get it out of my brain. My brain starts hyperfocusing on the next "cool idea" and it stops me sleeping and concentrating on other things. So what I do is I start a new project folder and write down my thought son the project until I run out of ideas. Then my brain is "satisfied" with "work" and promptly loses interest. I have learned to not feel guilt about these. It's just a thing I need to do for my mental health, like I have to sometimes clear out my ear wax.