Hadithcore
Sunan an-Nasa'i, 1627
sahih· Darussalam

It was narrated that Anas said:

"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."

أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا يَزِيدُ، قَالَ أَنْبَأَنَا حُمَيْدٌ، عَنْ أَنَسٍ، قَالَ مَا كُنَّا نَشَاءُ أَنْ نَرَى رَسُولَ اللَّهِ صلى الله عليه وسلم فِي اللَّيْلِ مُصَلِّيًا إِلاَّ رَأَيْنَاهُ وَلاَ نَشَاءُ أَنْ نَرَاهُ نَائِمًا إِلاَّ رَأَيْنَاهُ ‏.‏

References2 variants
In-Book Reference
Book 20, Hadith 30
English Reference
Vol. 2, Book 20, Hadith 1628