The uncle of 'Abbaad bin Tamim, 'Abdullah bin Zayd Radiyallahu 'Anhu reports:
"I have seen Rasulullah Sallallahu 'Alayhi Wasallam lying flat on his back in the masjid, with one leg resting on the other.
English reference: Book 20, Hadith 121
Arabic reference: Book 21, Hadith 128