suptir nidrā-vibhāvā syān nānārthānubhavātmikā
suptir nidrā-vibhāvā syān nānārthānubhavātmikā |
indriyoparati-śvāsa-netra-saṁmīlanādi-kṛt ||
(Bhakti-rasāmṛta-sindhu: 2.4.176)
“Sleep (nidrā) wherein there are variegated bhāvas constituted of experience of various objects shall be [called] supti [i.e., light sleep, or, dreaming]. It is a cause of inactivity of the senses, heavy breathing, shutting the eyes, and so forth.”