[aytigra]

For me, even if I drop into "mental space" completely and stop seeing(or being aware of) real world while thinking about something I saw/did recently, vividness of this mental image will depend on how close I am to dream state, but even so I think I can never see this image with a lot of details, I think even in my dreams I never see very detailed image.

It is like seeing with peripheral vision, I know that is there and sometimes see it with quick glances, but details only appear if I focus on some part of it and disappear quickly when focus shifts.