योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-63, verse-3

वर्णोच्चारोऽभविष्यच्चेत्प्रकटार्थस्ततः क्वचित् ।
स्वप्नेष्वन्वभविष्यत्तं विनिद्रः पार्श्वगो जनः ॥ ३ ॥

varṇoccāro'bhaviṣyaccetprakaṭārthastataḥ kvacit ,
svapneṣvanvabhaviṣyattaṃ vinidraḥ pārśvago janaḥ 3

3. And should there even be an articulate sound, yet there can be no intelligible sense in it; and [it] must [be] unintelligible to others; just as a dream though perceived by the dreamer, is unknown to the sleepers in the same bed and side by side.