I just mentioned this in my reply above, I was waiting for someone else to post. Editing didn't allow me insert another quote. So, I had to watch my glaringly obviously nearly 3am typos.
I used to lucid dream a lot, when I was younger. I did the typical peptalk before bed. Remind myself I was in control, and to trying to take an action that wasn't feasible outside of a dreamscape. Like the Totems in Inception. Didn't always work, but I had a 50% chance.
I have also experienced lentation, when I nearly fell off a roof. Didn't move faster, but enough mental processing speed and reaction to catch myself and not break something or die.