Do you believe we all travel through space and time when we dream?

Why or why not?

No. Not even mentally.

Why not? Its like asking 'When I close my eyes and think about waking on the moon, am I momentarily walking on the moon?'. In both cases the scene is imagined, and part of the internal projection of the mind.

Some of us fortunate ones have guides to travel with us.

Time passes and this old earth ain't sitting still, so I guess that's a valid statement.

Well, not that i have ever made any research on the matter, So, I'm just talking from personal experience here; Sometimes, when I am on the point of waking up or maybe going to sleep, I can't remember, I have this feeling that I'm spinning, like my soule had gone out of my body and is trying to come back in; And it's a very weird feeling.
Scary at times.
It does feel good, in the way that being on a rollercoster does, so it's a bit like you don't have any control and it's kind of exciting, but a wee bit scary.
I couldn't say if it's got anything to do with space or not though!