B.G 18.39

यदग्रे चानुबन्धे च सुखं मोहनमात्मनः। निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् ॥३९॥

yadagre cānubandhe ca sukhaṃ mohanamātmanaḥ। nidrālasyapramādotthaṃ tattāmasamudāhṛtam ॥39॥

[यत् (yat) - that which; अग्रे (agre) - in the beginning; च (ca) - and; अनुबन्धे (anubandhe) - in the result; च (ca) - and; सुखम् (sukham) - happiness; मोहनम् (mohanam) - delusion; आत्मनः (ātmanaḥ) - of the Ātmān; निद्रा (nidrā) - sleep; आलस्य (ālasya) - laziness; प्रमाद (pramāda) - negligence; उत्थम् (uttham) - arising from; तत् (tat) - that; तामसम् (tāmasam) - in the mode of ignorance; उदाहृतम् (udāhṛtam) - is declared;]

That happiness which is derived from sleep, laziness, and negligence, and which deludes the Ātmān both in the beginning and in the end, is said to be of the nature of ignorance.