[30] "And how, Mahānāma, is a noble disciple (ariyasāvaka) devoted to wakefulness? Here, Mahānāma, during the day a noble disciple purifies the mind (citta) of obstructive states by walking and by sitting; in the first watch of the night he purifies the mind of obstructive states by walking and by sitting; in the middle watch of the night he lies down on his right side in the lion's posture, placing one foot upon the other, mindful and clearly comprehending, having attended to the perception of the time for rising; in the last watch of the night, having risen, he purifies the mind of obstructive states by walking and by sitting. Thus, Mahānāma, is a noble disciple devoted to wakefulness."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.