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Originally posted by xxpigxx
Some say it is your astral body returning from an out of body experience . . . or something like that.
A hypnic or hypnagogic jerk is an involuntary muscle twitch (commonly known as a myoclonic twitch) which occurs during the transition into hypnagogia. It is often described as an electric shock or falling sensation, and can cause movement of the body in bed. Hypnic jerks are experienced by most people, especially when exhausted or sleeping uncomfortably.
Nocturnal myoclonus, also called Periodic Limb Movement Disorder (PLMD), is a sleep disorder where the patient moves limbs involuntarily during sleep and has symptoms or problems related to the movement. If the patient moves limbs during sleep but there are no consequences, it is simply called periodic limb movements of sleep (PLMS). Not all patients with PLMS have PLMD (in fact, most people with PLMS do not have a disorder requiring any treatment).
PLMS is diagnosed with the aid of a polysomnogram or PSG. PLMD is diagnosed by first finding PLMS on a PSG, then integrating that information with a detailed history from the patient and/or bed partner. PLMS can range from a small amount of movement in the ankles and toes, to wild flailing of all four limbs. These movements, which are more common in the legs than arms, occur for between 0.5 and 5 seconds, recurring at intervals of 5 to 90 seconds. A formal diagnosis of PLMS requires three periods during the night, lasting from a few minutes to an hour or more, each containing at least 30 movements followed by partial arousal or awakening.
Originally posted by rezial666
What about being woke to a loud piercing noise or more like a very loud beep? So loud it sounds as if someone is setting it off next to your ear. This happens to me sometimes when I am just falling asleep. There is no explanation for where the sound is from and there is nothing in my room that makes a sound similar to what I hear. But it snaps me to wake with a jerk.