حَدَّثَنَا يَحْيَى بْنُ مَعِينٍ، حَدَّثَنَا هِشَامُ بْنُ يُوسُفَ، عَنْ مَعْمَرٍ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنْ أُخْتِ أُمِّ سُلَيْمٍ الرُّمَيْصَاءِ، قَالَتْ نَامَ النَّبِيُّ صلى الله عليه وسلم فَاسْتَيْقَظَ وَكَانَتْ تَغْسِلُ رَأْسَهَا فَاسْتَيْقَظَ وَهُوَ يَضْحَكُ فَقَالَتْ يَا رَسُولَ اللَّهِ أَتَضْحَكُ مِنْ رَأْسِي قَالَ ‏"‏ لاَ ‏"‏ ‏.‏ وَسَاقَ هَذَا الْخَبَرَ يَزِيدُ وَيَنْقُصُ ‏.‏

Umm Sulaim Al Rumaisa said “The Prophet(PBUH) slept and awoke while she was washing her head.” He awoke laughing. She asked “Apostle of Allaah(PBUH) are you laughing at my head?” He replied, No. She then narrated the rest of the tradition enlarging and reducing. Abu Dawud said: Al-Rumaisa was the foster sister of Umm Sulaim. Translation Not Available

Book Ref: Sunan Abi Dawud Book 15 Hadith 2492
Web Ref:  Sunan Abi Dawud Book 14 Hadith 2486