Photographer Franco Banfi and a team of scuba divers were following a pod of sperm whales when suddenly the large creatures became motionless and began to take a synchronized vertical rest. This strange sleeping position was first discovered only in 2008, when a team of biologists from the UK and Japan drifted into their own group of non-active sperm whales. After studying tagged whales the team learned this collective slumber occurs for approximately 7 percent of the animal’s life, in short increments of just 6-24 minutes.