In plain words
That happiness which deludes the self both at the beginning and in its consequence, arising from sleep, laziness, and negligence, is declared tāmasa.
Word for word
The happiness which both at first and in its sequel is deluding to oneself, arising from sleep, sloth and heedlessness, that is declared tāmasa.
यदग्रे चानुबन्धे च सुखं मोहनमात्मनःनिद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम्
Other commentaries
The commentators
▸Bhagavadgītābhāṣyam· bhāṣya
यत् अग्रे च अनुबन्धे च अवसानोत्तरकाले च सुखं मोहनं मोहकरम् आत्मनः निद्रालस्यप्रमादोत्थं निद्रा च आलस्यं च प्रमादश्च तेभ्यः समुत्तिष्ठतीति निद्रालस्यप्रमादोत्थम् , तत् तामसम् उदाहृतम् ॥ ३९ ॥
In plain words
The pleasure that clouds you at the start and clouds you again in what comes after — in the stretch of time once it has ended — pleasure that deludes the self, that produces delusion in it; pleasure that is nidrālasyapramādottha. Sleep, and laziness, and carelessness: it rises up out of these three. That is what the word means — arisen from sleep, laziness, carelessness. Such pleasure is declared tāmasa, born of darkness.
Close to the Sanskrit
That pleasure which, at the beginning and in the sequel — and in the time after its cessation — is deluding, that is, delusion-producing for the self, and which is nidrālasyapramādottha: 'sleep, and indolence, and heedlessness — it rises up out of these,' hence 'arisen from sleep, indolence and heedlessness' — that is declared tāmasa.