Messenger of Allah ﷺ used to pray two light rakʿat before the morning (compulsory) prayer after the day dawned and the Mu'adh-dhin had finished his Adhan. He then would lie on his right side till the Mu'adh-dhin came to pronounce the Iqama.  

كَانَ رَسُولُ اللَّهِ ﷺ إِذَا سَكَتَ الْمُؤَذِّنُ بِالأُولَى مِنْ صَلاَةِ الْفَجْرِ قَامَ فَرَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ قَبْلَ صَلاَةِ الْفَجْرِ بَعْدَ أَنْ يَسْتَبِينَ الْفَجْرُ ثُمَّ اضْطَجَعَ عَلَى شِقِّهِ الأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ لِلإِقَامَةِ  

The Prophet ﷺ used to pray eleven rakʿat in the late part of the night, and when dawn appeared, he would offer two rakʿat and then lie on his right side till the Muadhdhin came to inform him (that the morning prayer was due).  

عَنْ عَائِشَةَ ؓ كَانَ النَّبِيُّ ﷺ يُصَلِّي مِنَ اللَّيْلِ إِحْدَى عَشْرَةَ رَكْعَةً فَإِذَا طَلَعَ الْفَجْرُ صَلَّى رَكْعَتَيْنِ خَفِيفَتَيْنِ ثُمَّ اضْطَجَعَ عَلَى شِقِّهِ الأَيْمَنِ حَتَّى يَجِيءَ الْمُؤَذِّنُ فَيُؤْذِنَهُ  

'A'isha reported that the Messenger of Allah ﷺ used to pray eleven rak'ahs at night, observing the Witr with a single rak'ah, and when he had finished them, he lay down on his right side, till the Mu'adhdhin came to him and he (the Holy Prophet) then observed two short rak'ahs (of Sunan of the dawn prayer).  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصَلِّي بِاللَّيْلِ إِحْدَى عَشْرَةَ رَكْعَةً يُوتِرُ مِنْهَا بِوَاحِدَةٍ فَإِذَا فَرَغَ مِنْهَا اضْطَجَعَ عَلَى شِقِّهِ الأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ فَيُصَلِّي رَكْعَتَيْنِ خَفِيفَتَيْنِ  

[Machine] The Messenger of Allah ﷺ used to pray eleven units of prayer during the night. When the dawn came, he would pray two quick units of prayer, then lie down on his right side until the Mu'adhin calls him for prayer.  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي مِنَ اللَّيْلِ إِحْدَى عَشْرَةَ رَكْعَةً فَإِذَا فَجَرَ الْفَجْرُ صَلَّى رَكْعَتَيْنِ خَفِيفَتَيْنِ ثُمَّ اتَّكَأَ عَلَىشِقِّهِ الْأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ يُؤْذِنُهُ لِلصَّلَاةِ  

[Machine] The Messenger of Allah ﷺ used to pray eleven units (rak'ahs) after the evening prayer (Isha), then in the morning, he would pray two light units (rak'ahs), and then he would lie down on his right side until the Muadhin (caller to prayer) came and called him for prayer.  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي بَعْدَ الْعِشَاءِ إِحْدَى عَشْرَةَ رَكْعَةً فَإِذَا أَصْبَحَ صَلَّى رَكْعَتَيْنِ خَفِيفَتَيْنِ ثُمَّ اضْطَجَعَ عَلَى شِقِّهِ الْأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ فَيُؤْذِنَهُبِالصَّلَاةِ  

"When the Muaddhin fell silent after the Adhan for the beginning of Fajr, he would pray two brief rak'ahs, then he would lie down on his right side." (Using translation from Nasāʾī 1762)  

«كَانَ رَسُولُ اللَّهِ ﷺ إِذَا سَكَتَ الْمُؤَذِّنُ بِالْأَوَّلِ مِنْ صَلَاةِ الْفَجْرِ قَامَ فَرَكَعَ رَكْعَتَيْنِ خَفِيفَتَيْنِ قَبْلَ صَلَاةِ الْفَجْرِ بَعْدَ أَنْ يَتَبَيَّنَ لَهُ الْفَجْرُ ثُمَّ اضْطَجَعَ عَلَى شِقِّهِ الْأَيْمَنِ حَتَّى يَأْتِيَهُ الْمُؤَذِّنُ لِلْإِقَامَةِ»