Sleep Comes From Heat

az-Zarnuji (may Allah have Mercy on him) said:

“Al-Hasan bin Ziyad began studying at the age of 80, and for forty years, he did not sleep an entire night on his bed, and Muhammad bin al-Hasan ash-Shaybani would not sleep at night. He would place his books in front of him, and if he became bored of one book, he’d move on to another. He would also place in front of him a container of water that he’d use to keep himself awake, saying: “Sleep comes from heat, and one must repel it with cold water.”

‘Ta’lim al-Muta’allim wa Turuq at-Ta’allum’ (p. 23)