it seems so far that when i have a series of lucid dreams at one time (i.e 4 lucid dreams in 1 night - this has happened twice so far)
that most of the first few ones end in me walking from my starting position and after i relise im lucid a few seconds later a darkness go's over my vision and then the same situation repeats a few times and then i get a normal lucid where it wont black out atleast until the end of the dream

now my question is, is there anyway to stop this black out because i try to speak out loud but something stops me ( i have trouble talking in lucid dreams my first speech in a lucid dream is very low volume and then its fine after a first word beside that ), is there any method to stop this besides rc's,
does yelling out something help? concentrating hard?

please give me some advice because i would like to have all my lucids go long if im able to help it