I am not sure if I twitch or not during the different sleep or sort of sleep states, I do know my ptsd sleep isn't good for anyone around me. There is that weird dream state with ptsd when you are still mobile, unlike REM, but you still dream and move. Or rather, that is my experience. More than once my movements have sent either of my loving dogs across the room while twitching, poor girls they are just being loving and comforting. I have nudged, pushed and pushed my wife off the bed in this sleep.
I sleep in another room so I don't do this, or interfere with everyone else sleeping. However, more than once I have woken while reliving things, and spun around to kick. When I wake sweaty and my dogs are sleeping close to me but out of reach I know I have been in this state.
Hopefully this makes sense and helps. Be well.