This week i had two lucids and i think it was just last night in my second lucid when my dream was dark. I tried to turn it into day time by saying i think it was, turn on light or something, it didn't work, i said it twice and the dream ended. What is the cause of some people not being able to speak or having trouble speaking in dreams? And how can you fight this? Because while i was saying those things, i could barely move or open my mouth. And another thing, in almost all my dreams i hardly ever attempted to speak, lucid or not. 90 percent of my dreams i don't speak.