I have another interesting link : a conversation between LaBerge anf Tholey.
Link : https://sawka.com/spiritwatch/conversa.htm
Quote :
"Tholey: I remember once when I slept in the lab, I was in a lucid state two times for five hours during that night. I was able to direct all the dreams!
LaBerge: I am still interested in the stage of sleep you were in. When you say, “I was lucid the whole night,” do you mean that you have some way of knowing that you were lucid for every minute of the night or that it would happen again and again throughout the night?
Tholey: The physiological data and the phenomenological data prove it. I also signaled in between. There is another important thing that happened. I had the experience that, all of a sudden, I was awake and in a totally different situation and then, all of a sudden, in the dream situation again. I restabilized the dream mainly with eye movements and movements of the body."