عَنْ عُرْوَةَ عَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِذَا رَكَعَ رَكْعَتَيِ الْفَجْرِ اضْطَجَعَ عَلَى شِقِّهِ الْأَيْمَنِ
It is narrated from Sayyidah Aisha (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) performed the two rak'ahs of Fajr, he would lie down on his right side.