I woke up around 2 AM as usual (unfortunately) and rolled from one side to the other one. At that time, the worst twitching concert began - abdominal, chest, both arms, back and thighs muscles started to twitch rapidly, all at once. It did not last more than 30 seconds but I have never experienced such a terrible "attack". I spent the rest of the night awake, thinking how this can be "nothing" :/