Which thoughts to defuse and which to listen to?

I just spent over an hour lying in bed thinking variously "I should get up and clean the floors", "I don't want to clean the floors", "what's the point in cleaning the floors", "there's no point in doing anything" and then trying to defuse the last thought, then trying to defuse the "I should" thought, then wondering if I'm just using thought defusion to avoid cleaning the floors, then wondering if I really want to clean the floor or if I should do something else instead, then trying to work out what it is i would do instead, then remembering I was trying to practice defusion but couldn't work out what thought to practice it on, then realising that the thought that I don't know what to practice it on is just a thought, as is that thought, as is everything that was running through my head for the last hour or so.

But if everything is a thought and I don't know what it is that I should be doing, how do I know when to try and defuse and when to just...do something?