Al-Adab Al-Mufrad, Book 37, Hadith 878 (English) ⓘ

'A'isha said, "The Prophet, may Allah bless him and grant him peace, was sleepless one night and said, 'Would that a man of righteous action among my Companions would come and guard me tonight!' Then he heard the sound of weapons. He asked, 'Who is it?' 'Sa'd,' came the answer. Sa'd said, 'Messenger of Allah, I have come to guard you.' The Messenger of Allah, may Allah bless him and grant him peace, slept and we heard him snore."

حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، قَالَ‏:‏ حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، قَالَ‏:‏ حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ قَالَ‏:‏ سَمِعْتُ عَبْدَ اللهِ بْنَ عَامِرِ بْنِ رَبِيعَةَ يَقُولُ‏:‏ قَالَتْ عَائِشَةُ‏:‏ أَرِقَ النَّبِيُّ صلى الله عليه وسلم ذَاتَ لَيْلَةٍ فَقَالَ‏:‏ لَيْتَ رَجُلاً صَالِحًا مِنْ أَصْحَابِي يَجِيئُنِي فَيَحْرُسَنِي اللَّيْلَةَ، إِذْ سَمِعْنَا صَوْتَ السِّلاَحِ، فَقَالَ‏:‏ مَنْ هَذَا‏؟‏ قَالَ‏:‏ سَعْدٌ يَا رَسُولَ اللهِ، جِئْتُ أَحْرُسُكَ، فَنَامَ النَّبِيُّ صلى الله عليه وسلم حَتَّى سَمِعْنَا غَطِيطَهُ‏.‏