सर्वप्रकारप्रमितिप्रशान्ति -र्बीजात्मनावस्थितिरेव बुद्धेः ।सुषुप्तिरत्रास्य किल प्रतीतिःकिञ्चिन्न वेद्मीति जगत्प्रसिद्धेः ॥ १२३ ॥
In plain words
Deep sleep is the total quieting of every kind of knowing - nothing but the intellect resting in its seed-form, unmanifest. And everyone, without exception, recognizes the experience it leaves behind: 'I knew nothing at all.'
Close to the Sanskrit
[Deep sleep is] the complete cessation of all kinds of cognition — merely the abiding of the intellect in its seed [causal] state. Here, the experience of this [person] is indeed, 'I know nothing whatsoever' — this being universally well known.