I find this odd. Have you worked on any of those ideas?
Whenever I have a thought, I write it down. If I got that thought again, I might do a quick Google search and then give a rating to the idea. If I kept constantly thinking about it, I start researching it.
The research part might take maybe an hour a week. The other steps don't really take much time.
I find this to help with procrastination or losing focus.