Valmiki Ramayana Yuddha Kanda Sarga 60 Shloka 51

अन्ये others, उदकुम्भशतानि hundreds of pails of water, कर्णयोः in the ears, समसिञ्चन्त distressed, महानिद्रावशंगतः under the spell of deep sleep, कुम्भकर्णः Kumbhakarna, नपस्पन्दे not wake up.

Some poured hundreds of pails of water into ears, distressed that he did not wake up under the spell of deep sleep.