My left eye upper lid has been twitching for 2 months now. i get plenty of sleep and does not consume any caffeine. what could be the problem?

Doctor can examine: Twitching of an eyelid, which happens in normal people, may be myokymia (an involuntary, spontaneous, quivering of a few muscle cell bundles within a muscle). Myokymia starts and stops spontaneously. In the eyelids, it can last a few minutes to a few days. One should see an ophthalmologist (MD eye doctor) if such symptoms persist, keep recurring, or are combined with any other symptoms.