Vigilance
"As soon, brahman, as a monk is moderate in eating, the Tathagata disciplines him further, saying: 'Come you, monk, dwell intent on vigilance; during the day while pacing up and down, while sitting down, cleanse the mind of obstructive mental states; during the middle watch of the night, lie down on the right side in the lion posture, foot resting on foot, mindful, clearly conscious, reflecting on the thought of getting up again; during the last watch of the night, when you have arisen, while pacing up and down, while sitting down, cleanse the mind of obstructive mental states.'