यत्र सुप्तो न कञ्चन कामं कामयते न कञ्चन स्वप्नं पश्यति तत् सुषुप्तम् ।सुषुप्तस्थान एकीभूतः प्रज्ञानघन एवानन्दमयो ह्यानन्दभुक् चेतोमुखः प्राज्ञस्तृतीयः पादः ॥ ५ ॥
In plain words
Deep sleep is where the sleeper desires no desire and sees no dream. The third quarter, Prājña, has deep sleep as its field; there all experience is undifferentiated, a mass of consciousness, full of bliss, the experiencer of bliss, and the doorway to waking and dream.