Verse 1.15

अन्यथा गृह्णतः स्वप्नो निद्रा तत्त्वमजानतः ।
विपर्यासे तयोः क्षीणे तुरीयं पदमश्नुते ॥ १५ ॥

anyathā gṛhṇataḥ svapno nidrā tattvamajānataḥ |
viparyāse tayoḥ kṣīṇe turīyaṃ padamaśnute || 15 ||

What is a dream (Svapna) ? Its a wrong understanding or mistake (अन्यथाग्रहण )! { a rope is mistakenly seen as a snake }

“I donot know the reality (Turiya) and I see an Error or the ‘Dream world’“

निद्रा तत्त्वमजानतः / nidrā tattvamajānataḥ – Here , Nidra means doesnot know the reality (तत्त्वमजानतः )

विपर्यासे तयोः क्षीणे (viparyāse tayoḥ kṣīṇe) – It means when Ignorance goes away … how?? By knowledge then ….

‘turīyaṃ padamaśnute‘ (तुरीयं पदमश्नुते ) : i.e. you realise yourself as the pure consciousness “Turiya”.