Last night as I was falling asleep I started to imagine, I guess it was HI walking down a set of stairs. This didn't feel like a dream but on the verge of one. Then I would suddenly trip and feel it physically in my bed, like I just fell down on the bed. Ive had this before, seems to be on nights where I am really tired and there has been different situations all of them I either fall or trip though. What is this a sign of? I hear people have a falling sensation when passing into dreamstate but whenever I have this I always hit the ground and then wake up. Maybe there is a way to turn this to my advantage?