Be careful, though, as you never know where you might actually be, & it is kind of dangerous to do it in an area where you may or may not be safe!
Last LD I remember in the school category was when I got out of my seat (yeah, it was a FA!) I just flew up towards an area that I could see the teacher better. Yet I listened to the teacher very well. When I realize that I was not really awake (in one of my Sci-fis[see the description in the attaining lucidity section], to be exact!), I went back to my seat & officially woke up. The teacher just looked at me, & said, "Well, if you are done sleeping, why don't you tell the class what I just taught." I tell him what he taught, & he said, "Hey! How'd you know that was what I was teaching if you were not responding?" I just told him, "I had a Sci-fi!" He asked, "What is a Sci-fi?" I explained it to him, & now he doesn't make me lecture in front of the class anymore. Just remember that was a LD!