Originally Posted by
ZenVortex
The portion of the brain called the cerebellum is responsible for all muscular movement. When we fall asleep, it switches off (so we don't physically enact our dreams) and takes on a new function, which is to store dream memories. That is why when we awake, we can stimulate dream recall by moving something such as an arm or a leg -- or a finger. By moving the finger while falling asleep, it appears that we keep a small section of the cerbellum active, which is enough to trigger lucidity. [/b]