यदग्रे चानुबन्धे च सुखं मोहनमात्मनः।निद्रालस्यप्रमादोत्थं तत्तामसमुदाहृतम्॥
yad agre cānubandhe ca sukhaṃ mohanam ātmanaḥnidrālasya-pramādotthaṃ tat tāmasam udāhṛtam
Word by word
The verse says
The happiness that fools you from beginning to end, which comes out of sleep, laziness and not paying attention: that is called dark.
In plain words
The third kind, and the structure is different from the other two.
The first was poison then nectar. The second was nectar then poison. This one has no turn in it at all. It fools you the whole way through.
There is no good phase to point at. Something is being got from it, but nothing is ever actually enjoyed.
Where you've felt this · in health
You lose an evening to nothing in particular. Not resting, not working, not even enjoying yourself. At eleven you could not say what the evening contained, and the odd part is that you were not having a nice time at any point in it either.
Going deeper
A pleasure with no pleasant phase is the strangest item in this chapter and the most recognisable.
The other two kinds at least deliver something at some point. This one is called deluding from beginning to end, which means the satisfaction was never present, only expected. Something kept you there without ever paying out.
The three sources named are sleep, laziness and inattention. Not vices with any appetite behind them. All three are forms of absence, and what they produce is not enjoyment but the lack of anything requiring you to be present.
Which suggests what it actually offers, and it is worth naming because it is genuinely attractive. Not pleasure. Relief from having to be there. That is a real need, and this is the cheapest and least nourishing way of meeting it.