At the moment I'm thinking that types of seeing could be considered to be dreamsigns, rather than the things we actually see. Here are some types of seeing I'm playing with as possible "seeing/looking dreamsigns".

Something moves closer and closer to my face.
I follow something.
I see something through glass.
I switch my focus from near to the distance. (and vice versa).
I see blurriness when under water.

Regarding the "Something moves closer to my face", I'm thinking that could be a good one because the eyeballs have to go cross-eyed when an object moves close to your face which I think may cause the sleeping eyes in the real body to be stimulated in some way.

What do you think?