Has anyone ever experienced the koi sleeping sickness condition? They look dead but later when you come out to get them they are now at the bottom hibernating in the correct position. I have a fish right now that may have this. On and off over the last few days it has appeared dead and then later it appears more on the hibernating side. I'm in Chicago and it's too cold to do anything for the fish. It's a under 1 year old koi. I am going to attempt to get a picture.