स्वप्नजागरिते सुप्तिं भावाभावौ धियां तथा ।यो वेत्त्यविक्रियः साक्षात्सोऽहमित्यवधारय ॥ २२ ॥
In plain words
Dream, waking, dreamless sleep — and every thought that arises and falls away: one knows all of it directly, and is himself never altered. That one is what I am. Settle it as certain.
Close to the Sanskrit
Dream and waking, deep sleep, and likewise the presence and absence of thoughts — he who, changeless, knows these directly: 'I am that' — ascertain thus.