The System of the Vedanta according to Badarayana's Brahma-Sutras and Cankara's Commentary c8.s6.t5.5

c8.s6.t5.5

The difference of the two consists in the following: 1) even if all others sleep, Prāṇa remains awake; 2) all except it are subject to death, Bṛih. 1, 5, 21, by which here weariness is to be understood (p. 732, 2); 3) the Prāṇa, not the Indriyas, conditions by its remaining the continuance, and by its removal the destruction of the body; 4) the activity of all Indriyas is directed to objects [they are organs of relation] but not that of the Prāṇa; 5) that "they became part of its nature" (Bṛih. 1, 5, 21) means that the Indriyas are dependent on the Prāṇa, so far as it brings about their stimulation (parispanda); and for this reason also bear its name (prāṇa) in a metaphorical sense (p. 731, 8--732, 11).