Yep, that’s a very neat technique if you can have a good (and not very deep) sleep.
The other day I found myself in a void. That was by far the most clear “void” experience I’ve ever had. There was no need to escape or do anything (as I l was placed in a void by a DC to save me from something) I was mentally lucid and decided to explore it…
There was a distinct feeling of entering the void… kinda like passing through energy/force field.
Surprisingly I had no arms or body - just a point of view. There was a dark bluish glow in front of me and I focused on it for a while… nothing happened… I couldnt do anything and decided to enter a dream again
Then I decided to reenter a dream, and a cool thing happened - I turned back and saw the “end” of the void… kinda like it was bordering a room…
I moved towards it and entered a dream this way…