A naked man who jumped into and out of a pick up truck on Route 7 has sustained head injuries.  The incident started around 9:15am yesterday when a naked man was reported coming out of a wooded area near the Days Inn in Redding.  The man tried to open the doors of a vehicle stopped in traffic, but they were locked.  When traffic started moving toward the Wilton line, he jumped into the bed of the pickup truck, the driver called 911, and the man hopped out.  Wilton Police responded and found blood on the ground and said the man's injuries seemed serious.  He was transported to Danbury Hospital.  Since the man had no clothes on, he didn't have ID and Redding Police are investigating the case.