The four temporary states

Dear Rinpoche,
Do you know where I can find more explanations of the four temporary states: waking, sleeping, dreaming, sexual union?
It comes from the practice of Calling the Lama from Far Away. THANKS.

Venerable Dagpo Rinpoche: These subjects are treated in texts related to the tantras. They are intended for people who meet certain conditions, including obtaining a major initiation.