Sounds like you were experiencing some wonderful feelings related to your own evolution and ascension. It cd also be an indication of evolution and ascension for the race in general. Sounds like you were experiencing or are about to experience some very high states of understanding. Sounds like you've been studying and working on ideas like this for some time.
I'm sort of confused by the ending. Was the visitor referring to you when he said "Uh-oh one got in"? That sounded sort of like you were in a place you shdn't be, yet your feelings about it were all positive except for the fact that you cdn't stay awake. That might indicate that you are experiencing something that's pretty deep in your ucs or super-cs. You fell asleep to that. It's such a high place that you can't maintain the csness of it.
By the way the DREAM NETWORK JOURNAL is a good outlet for dreams like this. If you want you might get a copy of the journal or take a look at it online and if you want to, send the dream in for them to use.
http://www.dreamnetwork.net/