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Muscle twitchings are fairly common, and are often related to stress
or excess work load. They are referred to as "benign fasciculations". In your case, it may be related to excess work or less sleep. Most often, they are harmless and subside with rest.
As of now, you do not require to consult any doctor. However, if the symptoms persist for long time, you should consult a neurologist
Dr Sudhir Kumar MD DM (Neurologist)
Senior Consultant Neurologist
Apollo Hospitals, Hyderabad