Hadith 17:636
Muhammad ibn Abi ‘Adi narrated to us, from Ibn ‘Awn, who said: When Muhammad [ibn Sirin] would sleep, he would face the Qibla, and sometimes he would lie on his back.
حدثنا محمد بن أبي عدي عن بن عون قال كان محمد إذا نام استقبل القبلة وربما استلقى