I been occasionally staying at a lady friend's house and if I am in the same bed as her when we sleep then I constantly will get a hypnic jerk (snapping awake with a muscle twitch) to the point that it keeps me from sleeping and awakes her. I do not know what is causing it to happen in this environment based on research I looked up. I don't have this at home or other locations of sleep. It only seems to happen when we're on the same bed (her bed) together. I don't feel stressed when attempting to sleep. Pretty frustrated at trying to not only figure this out but also stop it. I do not know if it is the bed itself or her presence since I haven't had the bed to myself alone to test.