Abbad bin Tamim (may Allah have mercy on him) narrates from his paternal uncle (may Allah be pleased with him) that he said: I saw the Messenger of Allah (peace and blessings be upon him) in the mosque lying on his back with one foot placed over the other.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3210