This is a common complaint that I hear from my patients on a regular basis. Mild twitching of the eyelid is a fairly common phenomenon. Although these involuntary contractions of muscles are annoying, they are almost always temporary and completely harmless. The medical name for this kind of twitching is ocular myokymia. It is quite common and most often associated with fatigue. When your eye is twitching, it is usually not visible to anyone else. Lack of sleep, too much caffeine/alcohol, increased stress, dry eyes, and eyestrain due to needing a new optical prescription seem to be root causes. Often, gently massaging your eye will relieve the symptoms. Usually, the twitch will disappear after catching up on your sleep. Occasionally, the use of a cool compress and/or a topical antihistamine drop may also alleviate the twitch.