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'Abdullah ibn Zayd ibn 'Asim al-Mazini said, "I saw him." Malik ibn Isma'il asked Ibn 'Uyayna (who had transmitted this to him), "The Prophet, may Allah bless him and grant him peace?" He replied, "Yes, lying down with one of his feet over the other."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، قَالَ: حَدَّثَنَا ابْنُ عُيَيْنَةَ قَالَ: سَمِعْتُ الزُّهْرِيَّ يُحَدِّثُهُ، عَنْ عَبَّادِ بْنِ تَمِيمٍ، عَنْ عَمِّهِ قَالَ: رَأَيْتُهُ، قُلْتُ لِابْنِ عُيَيْنَةَ: النَّبِيُّ صلى الله عليه وسلم؟ قَالَ: نَعَمْ مُسْتَلْقِيًا، وَاضِعًا إِحْدَى رِجْلَيْهِ عَلَى الأُخْرَى.
sunnah.com