Jack Russell Who Attacks in His Sleep

My Jack Russell if awoken suddenly by someone touching him will immediately and without warning fly at the first person he can reach, This is terrifying and he is like two different personalities. He only does this if woken from sleep. He used to sleep with me but if I moved or turned in the bed he would attack me, I have had quite a few serious bites from him, however when he wakes up properly he looks confused and dazed and then starts whining and its like he doesn't know what he's done. This boy is a really loving dog but I am scared of him.