Criticism Of Critical Critique

I can’t sleep.
Just as well as I’m not in bed yet but, meanwhile, I’ve been thinking that if critical thinking is the 'thinking about thinking' then what about the criticism of critical thinking? Would that be the thinking about the thinking about thinking? And if I’m thinking about it, does it then mean that I’m thinking about the thinking about the thinking about thinking?
I mean, critical thinking is all well and good but one should be free to criticise it. In fact, I would argue that one must criticise critical thinking otherwise it isn’t critical thinking. But, thinking about it, if without criticism it then becomes simply thinking and I’m thinking about it then I’m back to thinking about thinking which is critical thinking…
The more I think about it, the more I think critical thinking is a bad thing, which is a good thing to come out of my critical thinking.
I’m going to bed.