Sayyiduna Abd al-Rahman bin Awf (may Allah be pleased with him), concerning this saying of Allah, the Mighty and Majestic: "Then, after the distress, He sent down upon you security in the form of drowsiness" [Al Imran: 154], said: "On the day of Uhud sleep was cast over us."
Hadith Referenceالمعجم الكبير للطبراني / العشرة / 283