The pineal gland also controls seratonin levels and makes you “tired” when it’s 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.
You’d go nuts and die in short order. Look up fatal insomnia, it’s a spongiform encephalopathy.