Oneiric Stasis is a the most extreme form of a Light-induced coma. It almost never happens naturally, and has only been officially recorded in happening with four individuals, under laboratory conditions. The term has only been used to describe controlled stasis for that reason.
When placed in Oneiric Stasis, the individual enters a personal "dream world." In a lab setting, it is necessary to pump nutrition and Chaos into the individual to maintain proper Chaos/Light levels to prevent personal destruction (once Stasis begins, the person remains in Stasis regardless of C/L levels).