Śrīmad-Bhāgavatam · Text 11.25.20
Who is speaking and story frame
सत्त्वाज्जागरणं विद्याद् रजसा स्वप्नमादिशेत् ।
प्रस्वापं तमसा जन्तोस्तुरीयं त्रिषु सन्ततम् ॥ २० ॥
sattvāj jāgaraṇaṁ vidyād
rajasā svapnam ādiśet
prasvāpaṁ tamasā jantos
turīyaṁ triṣu santatam
It should be understood that alert wakefulness comes from the mode of goodness, sleep with dreaming from the mode of passion, and deep, dreamless sleep from the mode of ignorance. The fourth state of consciousness pervades these three and is transcendental.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.