Somnia

Known as the plane of dreams, Somnia is where almost all entities go when they sleep. Very few being actually exist on this plane physically, such as G athug. With the exception of the Kalashtar due to their severance from Somnia, when a creature goes to sleep they essentially store all of their memories in Somnia like a sort of filing cabinet. A messy one. And when a creature experiences a dream, they are experiencing the (generally warped) memories of another that is tried in this messy filing cabinet. When a creature is resurrected from death, all of their memories in Somnia converge with their soul resting in Lathos on Meritas, where they will be born anew.