"Every time we wanted to see the Messenger of Allah ﷺ praying at night we saw him, and every time we wanted to see him sleeping, we saw him." (Using translation from Nasāʾī 1627)  

أَنْ نَرَى رَسُولَ اللهِ ﷺ فِي اللَّيْلِ مُصَلِّيًا إِلَّا رَأَيْنَاهُ وَمَا نَشَاءُ أَنْ نَرَاهُ نَائِمًا إِلَّا رَأَيْنَاهُ»  

"He used to pray 'Isha, then he would recite tasbih, then after that he would pray whatever Allah (SWT) willed (he should pray) of night prayer. Then he would go and sleep for as long as he had prayed. Then he would get up from sleep and pray for as long as he had slept, and this last prayer of his would continue until dawn." (Using translation from Nasāʾī 1628)  

عَنْ صَلَاةِ رَسُولِ اللهِ ﷺ فَقَالَتْ كَانَ «يُصَلِّي الْعَتَمَةَ ثُمَّ يُسَبِّحُ ثُمَّ يُصَلِّي بَعْدَهَا مَا شَاءَ اللهُ مِنَ اللَّيْلِ ثُمَّ يَنْصَرِفُ فَيَرْقُدُ مِثْلَ مَا صَلَّى ثُمَّ يَسْتَيْقِظُ مِنْ نَوْمَتِهِ تِلْكَ فَيُصَلِّي مِثْلَ مَا نَامَ وَصَلَاتُهُ تِلْكَ الْآخِرَةُ تَكُونُ إِلَى الصُّبْحِ»  

Allah's Apostle ﷺ kept standing in prayer (for such long hours) that his feet were swollen. They (his Companions) said: Verily, Allah has pardoned for thee the earlier and the later of thine sins. Thereupon he said: Should I not prove myself to be a grateful servant (of Allah)? (Using translation from Muslim 2819b)  

قَامَ النَّبِيُّ ﷺ حَتَّى تَوَرَّمَتْ قَدَمَاهُ فَقِيلَ لَهُ قَدْ غَفَرَ اللهُ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ وَمَا تَأَخَّرَ قَالَ «أَفَلَا أَكُونُ عَبْدًا شَكُورًا؟»  

"The Messenger of Allah ﷺ used to pray until he developed fissures in his feet." (Using translation from Nasāʾī 1645)   

كَانَ النَّبِيُّ ﷺ «يُصَلِّي حَتَّى تَزْلَعَ قَدَمَاهُ»