Our expert says:
This is a condition called "hypnic myoclonus". It actually happens because the brain releases its control over the spinal cord ( as is normal during sleep) and then, for some reason, a large muscle reflex is triggered - just as when your doctor taps your knee with a reflex hammer.
If it is preventing sleep, certain medications can suppress it. Ask your doctor if he would like to try very small doses of clonazepam.
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