As the muscles in your body relax during Stage 1 sleep, the reflex muscle contraction that may happen is called

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The reflex muscle contraction that can occur during Stage 1 sleep is called a hypnic jerk. This is a normal occurrence and is often described as a feeling of falling, as the muscle contractions can cause a sudden movement of the limbs. Autonomic cramps, restless leg syndrome, and hypnagogic image syndrome are not related to this specific phenomenon.

As the Muscles in Your Body Relax During Stage 1