BṚHADĀRAṆYAKA UPANISHAD · 4.3.11

तद् एते श्लोका भवन्ति --
स्वप्नेन शारीरम् अभिप्रहत्यासुप्तः सुप्तान् अभिचाकशीति ।
शुक्रम् आदाय पुनर् ऐति स्थानं हिरण्मयःपुरुष एकहंसः ॥

tad ete ślokā bhavanti --
svapnena śārīram abhiprahatyāsuptaḥ suptān abhicākaśīti ।
śukram ādāya punar aiti sthānaṃ hiraṇmayaḥpuruṣa ekahaṃsaḥ ॥

'On this there are these verses: 'After having subdued by sleep all that belongs to the body, he, not asleep himself, looks down upon the sleeping (senses). Having assumed light, he goes again to his place, the golden person, the lonely bird. (1)

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)