Dark scary lake

Hi

I dreamt on Wednesday night that I was standing at the edge of a dark lake. I couldn't see the bottom. The whole atmosphere was menacing and I was scared. I wanted the lake to drain to dispel that scary feeling and it did. Some fish flopped about in the bottom but otherwise it was muddy and okay.

Any ideas are welcome on the meaning of this. By the way, it was so visual that I'm using this in my fantasy story.
Olga