ॐ गुरुपरमात्मने नमः

5.121   सुषुप्त्यवस्था का

पुरुषः सुप्तोत्थितः सुषुप्तौ अनुभूतं सुखं अज्ञानं च स्मरन् परामृशति – “अद्याहं सुखं अस्वाप्सं न किञ्चिदवेदिषम्” इति। अनुभूतस्य सुखस्य अज्ञानस्य च प्रकाशकः साक्षी चेतनरूपः। एवं बुद्धेः विलयावस्था सुषुप्त्यवस्था।

What is the suṣupti avasthā

A person, upon waking up from suṣupti remembers the sukha and ajñāna that was experienced and says “Today I slept well, and knew nothing”. The sākṣī – which is of the nature of caitanya – is the illuminator of the sukha and ajñāna that was experienced. Thus, this avasthā into which the buddhi resolves is the suṣupti avasthā.