लयः कीर्तनश्रवणस्मरणेषु उत्तरेष्वाधिक्येन निद्रोद्गमः ।
layaḥ kīrtana-śravaṇa-smaraṇeṣu uttareṣv ādhikyena nidrodgamaḥ |
(Mādhurya-kādambinī: 4.2)
“Laya [i.e., mental slackening] means sleepiness increasing sequentially during kīrtana, śravaṇa, and smaraṇa.”