How common is sleep paralysis where you can actually move?

Sleep paralysis: Yes. In fact there is thought to be a genetic predisposition to developing the disorder. Many people with sleep disorders do not have waking paralysis. Between ⅓ and ½ of patients with narcolepsy also have sleep paralysis. The fragmentation of rem sleep for whatever reason leads to the disturbance. If you are able to move, then i would say your not experiencing sleep "paralysis" exactly.