Are these the same as what I call "micro-dreams"? When I'm trying to fall asleep I will get these tiny but full end to end dreams on situations and voices and p

Are these the same as what I call "micro-dreams"? When I'm trying to fall asleep I will get these tiny but full end to end dreams on situations and voices and places - but clearly I am not asleep. I'm in that "trying to fall asleep" phase. What is this called?