The Omnithi are a culture in the Cosmere.
They believe that their existence is not continuous, but rather that when they are asleep (or presumably unconscious) their experience comes to an end and is reborn the next day, inheriting their memories and beliefs from their previous incarnation.
They are mentioned by Arclo. He wonders why their society continues to exist given the belief that an individual only lasts for one day. He also comments about how hard such a philosophy is to disprove.
It has yet to be reviewed.