Vasiṣṭha's teaching (Mahārāmāyaṇa) 3.60.21

3.60.21

kalpe yadi nimeṣatvaṃ vetti kalpo'pyasau tataḥ .
nimeṣībhavati kṣipraṃ tādṛgrūpātmikā hi cit .. 21

20. [Sanskrit available] When our consciousness represents a twinkling of the eye as a Kalpa, we are led to believe a single moment an age of long duration. (As a short nap appears an age in dreaming), and (a long age as a moment as in the case of the seven sleepers of Kehef).

21. [Sanskrit available] And when we are conscious of or think a Kalpa age as a twinkling, the Kalpa age is thought to pass as a moment; and so a long night in our unconscious sleep, appears as a moment upon waking.