Ajahn Santutthi discusses a sutta from Ajahn Brahm's Word of the Buddha, entitled "Will" and then discusses sutta 3.35 from the Anguttara Nikaya: Hatthaka Sutta, "With Hatthaka", which is about good sleep.
Read AN 3.35 here on Sutta Central.
"The Buddha sleeps well, even on the cold, hard ground," Sutta Central.
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