Either when I first wake up or if I am very tired, I get 2 small hard to see circles of flickering dark bands in my vision.

They are hard to see unless I am looking at something that is bright such as a white painted wall or something like that. When there is nothing else to distract from seeing them.

They are small circles and they get more pronounced the more fatigued I get.

This is something that is perhps only a few months old when I started to notice them.

Any ideas on what this is?

Thank you

How long do they last?

How long do they last?

Its hard to tell since they are so hard to notice unless I am really tired.

I notice them most in the morning after waking up and at night when I am tired.

They might be thier during the day, but its very hard to see them.

That would seem to rule out migraine aura then.
You should get your eyes checked.