´It was narrated that Hafsah said:` "When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday."
Hadith ReferenceSunan an-Nasa'i / The Book of Fasting / Hadith: 2369
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:صحيح