Mandukya Karika, verse 2.5


स्वप्नजागरितस्थाने ह्येकमाहुर्मनीषिणः ।
भेदानां हि समत्वेन प्रसिद्धेनैव हेतुना ॥ ५ ॥

svapnajāgaritasthāne hyekamāhurmanīṣiṇaḥ |
bhedānāṃ hi samatvena prasiddhenaiva hetunā || 5 ||

5. The thoughtful persons speak of the sameness of the waking and dream states on account of similarity of objects (perceived in both the states) on grounds already described.

Shankara Bhashya (commentary)

The identity1 (of the experiences) of the dream and waking states is declared by the wise on account of the reason, already stated, i.e., the experience of objects (in both the states) is associated with subject-object2 relationship. This Kārikā enunciates the conclusion that has already been arrived at in the previous inference by the wise.