It was an interesting article I was reading in Readers Digest.
What those twitches and jerks that occasionally wake us up just as we are falling asleep? Usually in the leg. Hypnic Jerk according to David Bodani's The Body Book.
They occur when nerve fibres leading to the leg, in a bundle produces a harsh tightening of a tiny portion of muscle fibres that is linked to it down in the leg, and when they all fire together the leg twitches as a whole.
Sleep specialists haven't pinned down what causes hypnic jerks or why they occur only at the onset of sleep. Unlike myoclonic jerks - spasm, that occur at regular intervals during deep sleep.
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