Sushruta Samhita 3.4.33

3.4.33

nidrāṃ tu vaiṣṇavīṃ pāpmānamupadiśanti, sā svabhāvata eva sarvaprāṇino'bhispṛśati/ tatra yadā saṃjñāvahāni srotāṃsi tamobhūyiṣṭhaḥ śleṣmā pratipadyate tadā tāmasī nāma nidrā bhavatyanavabodhinī, sā pralayakāle; tamobhūyiṣṭhānāmahaḥsu niśāsu ca bhavati, rajobhūyiṣṭhānāmanimittaṃ, sattvabhūyiṣṭhānāmardharātre; kṣīṇaśleṣmanilabahulānāṃ manaḥśarīrābhitāpavatāṃ ca naiva, sā vaikārikī bhavati//

Sleep they teach to be Vaiṣṇavī and evil; by its very nature it visits all creatures. There, when phlegm abounding in darkness enters the channels carrying consciousness, then that non-awakening sleep called tāmasī occurs; it [happens] at the time of universal dissolution. For those abounding in darkness it occurs during day and night; for those abounding in passion it is without cause; for those abounding in goodness it occurs at midnight; and for those whose phlegm is diminished and wind is abundant, and who suffer mental and bodily anguish, it does not occur at all—that is morbid [sleeplessness].