Sandman

A Sandman is a being of good similar to an angel that goes around sprinkling dream dust on his charges to allow them to dream, and work out their inner conflicts. They are also known by their original latin name, Vir de somnio. They exist on a different plane, and under normal circumstances their charges aren't even aware of their existence, as they only come into contact while the person is asleep.

A sandman never sleeps, unless all of his charges are awake (which is a very rare occurrence.) They are made of dream dust, the same golden dust they carry around in satchels. If sandmen don't do their jobs, humans become more agitated and angered in their daily lives. ("Sand Francisco Dreamin'")

A sandman was among the good magical creatures to line up to attempt to pull Excalibur from it's stone. ("Sword and the City")