Bhagavad Gita 18.39

यदग्रे चानुबंधे च सुखं मोहनमात्मन: |
निद्रालस्यप्रमादोत्थं तत्तमसमुदाहृतम्

Translation

That happiness which covers the nature of the self from beginning to end, and which is derived from sleep, indolence, and negligence, is said to be in the mode of ignorance.