Sharon Stone is hoping to raise awareness of sudden infant death syndrome (SIDS) after the passing of her 11-month-old nephew, River Stone.The actress spoke with ET's Rachel Smith at premiere at SVA Theater in NYC on Wednesday, where she opened up about her family's tragedy.«We really have learned a lot about SIDS, sudden infant death, and we also learned a lot about organ donation, which was really one of the biggest comforts for our family because the loss of my godson was the salvation for