I wonder if fish have nightmares?

I'm proud of my fish cartoon, as it is the rare occasion that the idea that I had in my head and the finished product turn out alike.

But in drawing the cartoon, it made me wonder; Do fish have nightmares about being trapped under air? I don't know. I don't even know if they sleep, or if their dreams of flying scare the crap out of them.

What do you think?

Doc