References – AN 7.58: Nothing to Hide 
“How does one work with dullness and drowsiness in sitting meditation?” Answered by Ajahn Pasanno. [Sloth and torpor] [Posture/Sitting] // [Hindrances] [Ajahn Buddhadāsa] [Ajahn Chah] [Posture/Walking] [Culture/Natural environment] [Posture/Standing] [Continuity of mindfulness]
Sutta: AN 7.58 Capala Sutta: “Are you nodding, Moggallana?” [Great disciples]
Story: Ajahn Pasanno walks in the forest without a flashlight to dispel drowsiness. [Ajahn Pasanno] [Dtao Dum] [Devotion to wakefulness]
Our Roots in the Thai Forest Tradition [2014], Session 42, Excerpt 5