I had a similar multi-level dream experience here: http://forums.astraldynamics.com/viewtopic.php?t=1229

Oh and another multi-level dream here: http://forums.astraldynamics.com/viewtopic.php?t=1115

I seem to have a lot of multi-level dreams. Actually, that hadn't occured to me until now. Very interesting.

I'll have to get back to you on what that means.