The pineal gland tells every other part of your body whether it’s light or dark out. “Darkness to light?”
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.