Emaro

Those of the Emaro tribe are part of a special race that does not need much sleep. People from the Emaro tribe dislike settling down so most will take up strange jobs like working with hotels that the guild manages. The work suits them because it allows them to transfer all over the place. It's possible for them to sleep in halves similar to dolphins from Michio's world so he somewhat understands, but when trying to explain it to people of other races it’s almost always difficult. It is likely that the Emaro race evolved in the sea.