You know that when a man passes through the gate of death, he lays aside his physical and etheric bodies and for a short time has a retrospective view of his past life on earth. A kind of sleep then ensues and after a few months, or perhaps years, he wakens on the astral plane, in Kamaloka. Then follows the life in Kamaloka, when the earthly life is lived over again in backward order, three times as quickly.
Source: Rudolf Steiner – GA 130 – BUDDHA AND CHRIST: The Sphere of the Bodhisattvas – Milan, 21 September 1911
Translated by D. S. Osmond
It is remarkable that Steiner speaks here of a sleeping state of several months or years after death, between the retrospective view of a couple of days and the Kamaloka.
He says nothing about this in two of his most important books Occult Science (GA 13) and Theosophy (GA 9). I have never read this in other of his works either.