Why do torpor (styāna) and sleepiness (middha), restlessness (auddhatya) and regret (kaukṛtya), constitute, as groups, two hindrances?
59bc. Two hindrances [i.e., (1) torpor and sleepiness, and (2) restlessness and regret] make up one hindrance, because they have the same opposite, the same nourishment, the same function.556
“Opposite” (vipākṣa), i.e., counteragent (pratipakṣa), counter-nourishment (anāhāra);
1. The Sūtra teaches that torpor (styāna) and sleepiness (middha) have the same nourishment [āhāra], the same counter-nourishment:
What is the nourishment of torpor–sleepiness (styāna-middha)? Five factors, that is to say, exhaustion (tandrī),557 disgust (arati),558 yawning (vijṛmbhikā),559 uneven consumption of food (bhakte ’samatā),560 and sluggishness of thought (cetaso līnatva).561
What is its counter-nourishment? [9 b] Perception of light (ālokasaṃjñā).562
Torpor and sleepiness have the same function or task (kṛtya, kriyā): rendering thought languid (līna).