Prahlāda Mahārāja was always absorbed in thought of Kṛṣṇa. Thus, being always embraced by the Lord, he did not know how his bodily necessities, such as sitting, walking, eating, lying down, drinking and talking, were being automatically performed.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
आसीनः पर्यटन्नश्नन् शयानः प्रपिबन् ब्रुवन् । नानुसन्धत्त एतानि गोविन्दपरिरम्भितः
āsīnaḥ paryaṭannaśnan śayānaḥ prapiban bruvan | nānusandhatta etāni govindaparirambhitaḥ
SB 7.4.38