[525] And what, bhikkhus, is the nutriment (āhāra) for the arising of unarisen dullness and drowsiness (thīna-middha), or for the increase and expansion of dullness and drowsiness that has arisen? There are, bhikkhus, discontent (arati), lethargy, lazy stretching, drowsiness after meals, and sluggishness of mind (citta): frequently giving careless attention (ayoniso manasikāra) to these — this is the nutriment for the arising of unarisen dullness and drowsiness, or for the increase and expansion of dullness and drowsiness that has arisen.
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.