Twitching when falling asleep is known as a myoclonic twitch. Don't ask me how I know...it's just one of those tidbits you pick up along the way. I've heard two theories: Your body thinks it's falling and this is an attempt to right itself. And when you relax to sleep your respiration also relaxes and sometimes your brain thinks you've stopped breathing or are not breathing enough and 'jerks' you to make you start breathing again. Don't know which is true. I've done that type of twitching all my life.

The other type of twitching is my startle response that now set into high as its default. Even a thought about twitching can make me twitch. It's become just another thing for me to get used to with PTSD.

Lisa