What is a snappy way to express e.g. "my brain has switched off" that is familiar to native Chinese ears? It's common in English to say e.g.:

I've done so much work today, my brain has switched off.
No, I can speak Chinese.  She doesn't understand me because she has switched her ears off and is not listening.

It metaphorically refers to a body part which is temporarily not functioning: in the first example above, the brain switches itself off (like a computer crashing), and in the second example, the person switches their own ears off (they could listen, but have switched their ears off).  So sometimes when I'm talking with my teacher, I attempt to say something similar.  Perhaps I'd say:

我的脑子关掉了。 (&quot;My brain has switched off.&quot;)
她的听觉器官关闭了。 (&quot;Her hearing organs have switched off.&quot;)

But I've never succeeded... I always have to provide a long explanation which defeats the point, and I don't feel my teacher has ever understood my explanations either.  I'm getting the feeling I'm trying to force a square peg into a round hole.
Question: What is a snappy way to express e.g. &quot;my brain has switched off&quot; that is familiar to native Chinese ears?
I'd probably say something like 我脑袋不转了(my brain doesn't rotate anymore). This is a common analogy for a brain: a gear.