MĀṆḌŪKYA UPANISHAD · 5

यत्र सुप्तो न कञ्चन कामं कामयते न कञ्चन स्वप्नं
पश्यति तत् सुषुप्तम् । सुषुप्तस्थान एकीभूतः प्रज्ञानघन
एवानन्दमयो ह्यानन्दभुक् चेतोमुखः प्राज्ञस्तृतीयः पादः ॥ ५॥

yatra supto na kañcana kāmaṃ kāmayate na kañcana svapnaṃ
paśyati tat suṣuptam । suṣuptasthāna ekībhūtaḥ prajñānaghana
evānandamayo hyānandabhuk cetomukhaḥ prājñastṛtīyaḥ pādaḥ ॥ 5॥

When one sleepeth and yearneth not with any desire, nor seeth any dream, that is the perfect slumber. He whose place is the perfect slumber, who is become Oneness, who is wisdom gathered into itself, who is made of mere delight, who enjoyeth delight unrelated, to whom conscious mind is the door, Prajna, the Lord of Wisdom, He is the third.

Sri Aurobindo · CWSA 18, p. 194