The pineal gland also controls seratonin levels and makes you tired when its dark. Theoretically, removing the pineal could make one immune to fatigue at night, a benefit for night owls, performers, or sex crazies. I wonder if all these celebrities actually made the trip for medicinal reasons? Adrenochrome... surgery.
Youd go nuts and die in short order. Look up fatal insomnia, its a spongiform encephalopathy.