Shaking and Twitching During Sleep

Lately in my sleep I've been shaking and twitching, but not realizing it until I wake up. The only reason why I know that I have been is that my boyfriend will wake me up. Last night it took him thirty seconds to wake me up. Based on what he said, I respond to movement, twitching or shaking more when he touches me. I do not remember any of this, and it happens within the first ten minutes of me falling asleep.