CC Antya 19.73

nirantara ghumāya śaṅkara śīghra-cetana
vasi’ pāda cāpi’ kare rātri-jāgaraṇa
Word for word: 
nirantara — incessantly; ghumāya — sleeps; śaṅkara — Śaṅkara; śīghra — very quickly; cetana — waking up; vasi’ — sitting; pāda cāpi’ — massaging the legs; kare — does; rātri-jāgaraṇa — keeps awake at night.
Translation: 
Śaṅkara Paṇḍita would always fall asleep, but he would quickly awaken, sit up and again begin massaging the legs of Śrī Caitanya Mahāprabhu. In this way he would stay awake the entire night.