What IS that random twitch that plagues your arms or eyes when you don't get enough shut-eye?

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Alotofkink 34yo Looking for Men or Women Dallas, Texas, United States

Pulsing, irritating twitches - often under the eye or in the arm - plague many people when fatigue sets in, but they feel much more dangerous than they are. A neurologist explains what these pesky twitches are. more on Geo altCom
MichelleHayden 43yo Trenton, Michigan, United States