I stayed overnight in the house of my aunt Maimuna bint Al-Harith (the wife of the Prophet ﷺ ) while the Prophet ﷺ was there with her during her night turn. The Prophet ﷺ offered the ʿIsha' prayer (in the mosque), returned home and after having prayed four rakʿat, he slept. Later on he got up at night and then asked whether the boy (or he used a similar word) had slept? Then he got up for the prayer and I stood up by his left side but he made me stand to his right and offered five rakʿat followed by two more rakʿat. Then he slept and I heard him snoring and then (after a while) he left for the (Fajr) prayer. (Using translation from Bukhārī 117)   

بِتُّ فِي بَيْتِ خَالَتِي مَيْمُونَةَ بِنْتِ الْحَارِثِ زَوْجِ النَّبِيِّ ﷺ فَصَلَّى رَسُولُ اللهِ ﷺ الْعِشَاءَ ثُمَّ جَاءَ إِلَى مَنْزِلِهِ فَصَلَّى أَرْبَعَ رَكَعَاتٍ ثُمَّ نَامَ ثُمَّ قَامَ فَقَالَ نَامَ الْغُلَيْمُ؟ أَوْ كَلِمَةً تُشْبِهُهَا ثُمَّ قَامَ وَقُمْتُ عَنْ يَسَارِهِ فَجَعَلَنِي عَنْ يَمِينِهِ فَصَلَّى خَمْسَ رَكَعَاتٍ ثُمَّ صَلَّى رَكْعَتَيْنِ ثُمَّ نَامَ حَتَّى سَمِعْتُ غَطِيطَهُ أَوْ خَطِيطَهُ ثُمَّ خَرَجَ إِلَى الصَّلَاةِ  

Shurayh ibn Hani said: I asked Aisha about the prayer of the Messenger of Allah ﷺ. She said: The Messenger of Allah ﷺ never offered the night prayer and thereafter came to me but he offered four or six rak'ahs of prayer. One night the rain fell, so we spread a piece of leather (for his prayer), and now I see as if there is a hole in it from which the water is flowing. I never saw him protecting his clothes from the earth (as he did on that occasion). (Using translation from Abū Dāʾūd 1303)   

صَلَاةِ رَسُولِ اللهِ ﷺ فَقَالَتْ مَا صَلَّى رَسُولُ اللهِ ﷺ الْعِشَاءَ قَطُّ فَدَخَلَ عَلَيَّ إِلَّا صَلَّى أَرْبَعَ رَكَعَاتٍ أَوْ سِتَّ رَكَعَاتٍ وَلَقَدْ مُطِرْنَا مَرَّةً بِاللَّيْلِ فَطَرَحْنَا لَهُ نِطَعًا فَكَأَنَّنِي أَنْظُرُ إِلَى ثُقْبٍ فِيهِ يَنْبُعُ الْمَاءُ مِنْهُ وَمَا رَأَيْتُهُ مُتَّقِيًا الْأَرْضَ بِشَيْءٍ مِنْ ثِيَابِهِ قَطُّ  

[Machine] Narrated Ibn Abbas: The Messenger of Allah ﷺ said: "Whoever prays four rak'ahs after the last 'Isha', reciting in the first two rak'ahs 'Say: O disbelievers' (Al-Kafirun) and 'Say: He is Allah, the One' (Al-Ikhlas), and reciting in the last two rak'ahs 'Blessed is He in whose hand is the dominion, and He is able to do all things' (Al-Mulk) and 'Alif Lam Mim Tanzil' (As-Sajdah), he will receive the reward of four rak'ahs of Laylat al-Qadr (Night of Decree)." This was narrated by Ibn Farrukh al-Masri.  

عَنِ ابْنِ عَبَّاسٍ يَرْفَعُهُ إِلَى رَسُولِ اللهِ ﷺ قَالَ مَنْ صَلَّى أَرْبَعَ رَكَعَاتٍ خَلْفَ الْعِشَاءِ الْآخِرَةِ قَرَأَ فِي الرَّكْعَتَيْنِ الْأُولَيَيْنِ قُلْ يَأَيُّهَا الْكَافِرُونَ وَقُلْ هُوَ اللهُ أَحَدٌ وَقَرَأَ فِي الرَّكْعَتَيْنِ الْأُخْرَيَيْنِ تَبَارَكَ الَّذِي بِيَدِهِ الْمَلِكُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ وَالم تَنْزِيلُ السَّجْدَةَ كُتِبَ لَهُ كَأَرْبَعِ رَكَعَاتٍ مِنْ لَيْلَةِ الْقَدْرِ تَفَرَّدَ بِهِ ابْنُ فَرُّوخَ الْمِصْرِيُّ  

"Whoever performs wudu and performs wudu, well, then prays ('Abdur-Rahman said: and prays Isha), then prays after that four Rakahs and does them well (Sawwar said: and understands what he is reciting (Sawwar said: and recites therein), they will be equivalent to (praying) Lailat Al-Qadr for him". (Hasan Maqtu) (Using translation from Nasāʾī 4954)   

مَنْ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ ثُمَّ صَلَّى الْعِشَاءَ الْآخِرَةَ وَصَلَّى بَعْدَهَا أَرْبَعَ رَكَعَاتٍ فَأَتَمَّ رُكُوعَهُنَّ وَسُجُودَهُنَّ يَعْلَمُ مَا يَقْتَرِئُ فِيهِنَّ كَانَ لَهُ أَوْ قَالَ كُنَّ لَهُ بِمَنْزِلَةِ لَيْلَةِ الْقَدْرِ