Vedantasara - Verse 130
Sanskrit
भाट्टस्तु “प्रज्ञानघन एवानन्दमयः” (माण्डू उ ५) इत्यादिश्रुतेः सुषुप्तौ प्रकाशाप्रकाशसद्भावान्मामहं न जानामीत्याद्यनुभवाच्चाज्ञानोपहितं चैतन्यमात्मेति वदति
Swami Nikhilananda's Translation
The Bhattas on the contrary say that consciousness associated with ignorance is the self, on account of such Sruti passages as, “During dreamless sleep the Atman is undifferentiated consciousness and full of bliss” (Man. Up. 5), owing also to the fact that both consciousness and unconsciousness are present in a state of dreamless sleep and from such experience as, “I do not know myself,” etc.,
Index: Vedantasara

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