Language:
كتاب التفسير
65  
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
(11)
Allah's Statement: "...He sent down security for you. Slumber..." (V.3:154)
(11)
باب قَوْلِهِ ‏{‏أَمَنَةً نُعَاسًا‏}
Sahih al-Bukhari 4562

Narrated Abu Talha:

Slumber overtook us during the battle of Uhud while we were in the front files. My sword would fall from my hand and I would pick it up, and again it would fall down and I would pick it up again.

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ بْنِ عَبْدِ الرَّحْمَنِ أَبُو يَعْقُوبَ، حَدَّثَنَا حُسَيْنُ بْنُ مُحَمَّدٍ، حَدَّثَنَا شَيْبَانُ، عَنْ قَتَادَةَ، حَدَّثَنَا أَنَسٌ، أَنَّ أَبَا طَلْحَةَ، قَالَ غَشِيَنَا النُّعَاسُ وَنَحْنُ فِي مَصَافِّنَا يَوْمَ أُحُدٍ ـ قَالَ ـ فَجَعَلَ سَيْفِي يَسْقُطُ مِنْ يَدِي وَآخُذُهُ، وَيَسْقُطُ وَآخُذُهُ‏.‏
Reference : Sahih al-Bukhari 4562
In-book reference : Book 65, Hadith 84
USC-MSA web (English) reference : Vol. 6, Book 60, Hadith 85
  (deprecated numbering scheme)