ok in this dream i was laying down next to the edge of a cliff and then i rolled over and then i was falling for a long time then ryt when i was about to hit the floor i jump and wake myself up ...
i dont get it...

Could have been a hypnic jerk. They are very common.

The scene suggests a situation in which you are resting very at ease (lying down)but in a way that may also imply lying down on the job (because you are not in a bed). Lying at the edge of a cliff would suggest a situation in which the final outcome has not yet been ascertained (as in a ‘cliff hanger’).

Rolling over can imply that in this situation the role you play leads to a very great failing (roll over then I was falling for a long time)

You may need to jump start yourself into a waking state.(I jump and wake myself up) The scene suggests that you need to ‘wake up’ – to come to a greater state of awareness about this failing – and do it before you start to justify the failing on a principle. (before you hit the floor)