Ibn ʿAbbas said, "The Prophet ﷺ slept till he snored and then prayed (or probably lay till his breath sounds were heard and then got up and prayed)." Ibn ʿAbbas added: "I stayed overnight in the house of my aunt, Maimuna, the Prophet ﷺ slept for a part of the night, (See Fath-al-Bari page 249, Vol. 1), and late in the night, he got up and performed ablution from a hanging water skin, a light (perfect) ablution and stood up for the prayer. I, too, performed a similar ablution, then I went and stood on his left. He drew me to his right and prayed as much as Allah wished, and again lay and slept till his breath sounds were heard. Later on the Mu'adh-dhin (call maker for the prayer) came to him and informed him that it was time for Prayer. The Prophet ﷺ went with him for the prayer without performing a new ablution." (Sufyan said to ʿAmr that some people said, "The eyes of Messenger of Allah ﷺ sleep but his heart does not sleep." ʿAmr replied, "I heard ʿUbaid bin ʿUmar saying that the dreams of Prophets were Divine Inspiration, and then he recited the verse: 'I (Abraham) see in a dream, (O my son) that I offer you in sacrifice (to Allah)." (37.102) (See Hadith No. 183)  

أَنَّ النَّبِيَّ ﷺ نَامَ حَتَّى نَفَخَ ثُمَّ صَلَّى وَرُبَّمَا قَالَ اضْطَجَعَ حَتَّى نَفَخَ ثُمَّ قَامَ فَصَلَّى ثُمَّ حَدَّثَنَا بِهِ سُفْيَانُ مَرَّةً بَعْدَ مَرَّةٍ عَنْ عَمْرٍو عَنْ كُرَيْبٍ عَنِ ابْنِ عَبَّاسٍ قَالَ بِتُّ عِنْدَ خَالَتِي مَيْمُونَةَ لَيْلَةً فَقَامَ النَّبِيُّ ﷺ مِنَ اللَّيْلِ فَلَمَّا كَانَ فِي بَعْضِ اللَّيْلِ قَامَ النَّبِيُّ ﷺ فَتَوَضَّأَ مِنْ شَنٍّ مُعَلَّقٍ وُضُوءًا خَفِيفًا يُخَفِّفُهُ عَمْرٌو وَيُقَلِّلُهُ وَقَامَ يُصَلِّي فَتَوَضَّأْتُ نَحْوًا مِمَّا تَوَضَّأَ ثُمَّ جِئْتُ فَقُمْتُ عَنْ يَسَارِهِ وَرُبَّمَا قَالَ سُفْيَانُ عَنْ شِمَالِهِ فَحَوَّلَنِي فَجَعَلَنِي عَنْ يَمِينِهِ ثُمَّ صَلَّى مَا شَاءَ اللَّهُ ثُمَّ اضْطَجَعَ فَنَامَ حَتَّى نَفَخَ ثُمَّ أَتَاهُ الْمُنَادِي فَآذَنَهُ بِالصَّلاَةِ فَقَامَ مَعَهُ إِلَى الصَّلاَةِ فَصَلَّى وَلَمْ يَتَوَضَّأْ قُلْنَا لِعَمْرٍو إِنَّ نَاسًا يَقُولُونَ إِنَّ رَسُولَ اللَّهِ ﷺ تَنَامُ عَيْنُهُ وَلاَ يَنَامُ قَلْبُهُ قَالَ عَمْرٌو سَمِعْتُ عُبَيْدَ بْنَ عُمَيْرٍ يَقُولُ رُؤْيَا الأَنْبِيَاءِ وَحْىٌ ثُمَّ قَرَأَ {إِنِّي أَرَى فِي الْمَنَامِ أَنِّي أَذْبَحُكَ}  

One night I slept at the house of my aunt Maimuna and the Prophet ﷺ slept (too). He got up (for prayer) in the last hours of the night and performed a light ablution from a hanging leather skin. (ʿAmr, the sub-narrator described that the ablution was very light). Then he stood up for prayer and I got up too and performed the ablution in the same way and joined him on his left side. He pulled me to the right and prayed as much as Allah will. Then he lay down and slept and I heard his breath sounds till the Mu'adh-dhin came to him to inform him about the (Fajr) prayer. He left with him for the prayer and prayed without repeating the ablution. (Sufyan the sub-narrator said: We said to ʿAmr, "Some people say, 'The eyes of the Prophet ﷺ sleep but his heart never sleeps.' " ʿAmr said, "'Ubai bin ʿUmar said, 'The dreams of the Prophets are Divine Inspirations. Then he recited, '(O my son), I have seen in dream that I was slaughtering you (offering you in sacrifice).") (37.102)  

بِتُّ عِنْدَ خَالَتِي مَيْمُونَةَ لَيْلَةً فَنَامَ النَّبِيُّ ﷺ فَلَمَّا كَانَ فِي بَعْضِ اللَّيْلِ قَامَ رَسُولُ اللَّهِ ﷺ فَتَوَضَّأَ مِنْ شَنٍّ مُعَلَّقٍ وُضُوءًا خَفِيفًا يُخَفِّفُهُ عَمْرٌو وَيُقَلِّلُهُ جِدًّا ثُمَّ قَامَ يُصَلِّي فَقُمْتُ فَتَوَضَّأْتُ نَحْوًا مِمَّا تَوَضَّأَ ثُمَّ جِئْتُ فَقُمْتُ عَنْ يَسَارِهِ فَحَوَّلَنِي فَجَعَلَنِي عَنْ يَمِينِهِ ثُمَّ صَلَّى مَا شَاءَ اللَّهُ ثُمَّ اضْطَجَعَ فَنَامَ حَتَّى نَفَخَ فَأَتَاهُ الْمُنَادِي يُؤْذِنُهُ بِالصَّلاَةِ فَقَامَ مَعَهُ إِلَى الصَّلاَةِ فَصَلَّى وَلَمْ يَتَوَضَّأْ قُلْنَا لِعَمْرٍو إِنَّ نَاسًا يَقُولُونَ إِنَّ النَّبِيَّ ﷺ تَنَامُ عَيْنُهُ وَلاَ يَنَامُ قَلْبُهُ قَالَ عَمْرٌو سَمِعْتُ عُبَيْدَ بْنَ عُمَيْرٍ يَقُولُ إِنَّ رُؤْيَا الأَنْبِيَاءِ وَحْىٌ ثُمَّ قَرَأَ {إِنِّي أَرَى فِي الْمَنَامِ أَنِّي أَذْبَحُكَ}