योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-63, verse-23

एतेषां स्वप्नपुरुषास्त एवेमे वयं स्थिताः ।
ये च ते नाम संसारास्तेभ्य एकमिमं विदुः ॥ २३ ॥

eteṣāṃ svapnapuruṣāsta eveme vayaṃ sthitāḥ ,
ye ca te nāma saṃsārāstebhya ekamimaṃ viduḥ 23

23. To them our waking state appears as a dream, and they think us to be dreaming men, as we also think them to be; and as those worlds are viewed as visionary by us, so is this of ours but one of them also.