Bhagavatapurana 6.16.56

6.16.56

ubhayaṃ smarataḥ puṃsaḥ prasvāpapratibodhayoḥ /
anveti vyatiricyeta taj jñānaṃ brahma tat param //

56. To the intelligent being who, both in these states of sleep and wakefulness, remembers what appears to be common under both and at the same time distinct from both, that is (the) Consciousness and Para Brahman.