[Machine] That the Prophet, ﷺ , used to lie down after performing the two units of Fajr prayer, as narrated by others from Shu'bah, from Musa, from Sa'id, from the Prophet, ﷺ , intermittently as mentioned in these narrations. It has been mentioned in the established hadith from Kurayb, from Ibn Abbas, that indicates that his lying down was after Witr prayer. It is also possible that the narration of Malik suggests this. And Allah knows best.  

أَنَّ النَّبِيَّ ﷺ كَانَ إِذَا صَلَّى رَكْعَتَيِ الْفَجْرِ اضْطَجَعَ وَرَوَاهُ غَيْرِهِ عَنْ شُعْبَةَ عَنْ مُوسَى عَنْ سَعِيدٍ عَنِ النَّبِيِّ ﷺ مُنْقَطِعًا كَذَا فِي هَذِهِ الرِّوَايَاتِ وَقَدْ مَضَى فِي الْحَدِيثِ الثَّابِتِ عَنْ كُرَيْبٍ عَنِ ابْنِ عَبَّاسٍ مَا دَلَّ عَلَى أَنَّ اضْطِجَاعِهِ كَانَ بَعْدَ الْوِتْرِ وَقَدْ يَحْتَمِلُ ذَلِكَ مَا احْتَمَلَ رِوَايَةُ مَالِكٍ وَاللهُ أَعْلَمُ