In the Kalachakra system, the four states in which the mind produces impure appearances by means of the winds of karma passing through the corresponding four subtle creative energy-drops: (1) awake occasion (sad-pa'i gnas-skabs), (2) dream occasion (rmi-lam-gyi gnas-skabs), (3) deep sleep occasion (gnyid-'thug-gi gnas-skabs), and (4) fourth occasion (bzhi-pa'i gnas-skabs).
Tibetan: གནས་སྐབས་བཞི། gnas-skabs bzhi
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