Is there a background to the phrase 「熊出来てる」?


I was watching a TV drama, and one line was:

「熊出来てる」

I would translate it as "seems like a bear is coming out". In context, it
seems to refer to a person who has rings under their eyes, due to not getting
enough sleep, working too late into the night, etc.

But I am wondering how a bear relates to the meaning of this phrase. Thought I
would ask at the risk of it being too narrow a topic.




Don't know why snailboat didn't answer the question, but just to make an
answer:

くま can also be 隈, which is the dark circles under your eyes when you are tired
or don't get enough sleep, like when you have to do lots of overtime at
work...

