DD and I were talking about lucid dreams yesterday. Every time we do this, I then have a lucid dream that night. During last night’s lucid dream, I decided to try to talk. I tried and tired and tried, only I couldn’t form any words. So I tried really hard. It was very frustrating.
I was then vaguely aware of being moved and figured it was DH so I rolled over in my sleep and pondered the difficulty of talking during a dream.
This morning DH told me I was letting out blood curdling screams so loud that he was convinced that not one but many people were trying to murder me in my nightmare. He was trying to comfort me while I was busy pondering. 
So lucid dreamers- don’t try to speak during your dream. 