BG 18.39
यदग्रे चानुबन्धे च सुखं मोहनमात्मनः ।
निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् ॥
निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम् ॥
yad agre cānubandhe ca sukhaṁ mohanam ātmanaḥ
nidrālasya-pramādotthaṁ tat tāmasam udāhṛtam
nidrālasya-pramādotthaṁ tat tāmasam udāhṛtam
Word-for-word meanings
tat — that; sukham — happiness; yat — which; mohanam — [is] stupefying; ātmanaḥ — to the self; agre ca — in the beginning; anubandhe ca — and at the end; uttham — [and which] arises; nidrā — [from] sleep; ālasya — indolence; pramāda — [and] inadvertence; udāhṛtam — is called; tāmasam — tāmasika.
Translation
That happiness which stupefies the self both in the beginning as well as at the end, and which arises from sleep, indolence, and inadvertence, is called tāmasika.