Hypnos

This picture comes from the Facebook page of the British Museum. It is a Roman sculpture based on a Greek original representing Hypnos, the Greek god of sleep. The caption said that: "his wings allowed him to move swiftly over land and sea, and to fan the foreheads of the weary until they fell asleep. His son was Morpheus, the personification of dreams." So Hypnos was pretty much the most useful Greek god, especially for insomniacs like me.