Bhagavad-gītā As It Is · Text 18.39
Knowledge, action, determination and happiness in the modes
यदग्रे चानुबन्धे च सुखं मोहनमात्मन: ।
निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् ॥ ३९ ॥
yad agre cānubandhe ca
sukhaṁ mohanam ātmanaḥ
nidrālasya-pramādotthaṁ
tat tāmasam udāhṛtam
Translation
And that happiness which is blind to self-realization, which is delusion from beginning to end and which arises from sleep, laziness and illusion is said to be of the nature of ignorance.
Read Śrīla Prabhupāda's purport on Vedabase.io