योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-63, verse-4

तस्मान्न किंचित्स्वप्नेषु तत्सत्यं भ्रान्तिरेव सा ।
चिन्मात्राकाशकचनं तत्तथा खे स्वभावजम् ॥ ४ ॥

tasmānna kiṃcitsvapneṣu tatsatyaṃ bhrāntireva sā ,
cinmātrākāśakacanaṃ tattathā khe svabhāvajam 4

4. Therefore, there is nothing real in a dream; it is really an unreality and the ideal imagery of the Intellect in empty air, and concomitant with sleep of its own nature.