Hadithcore
Sunan Abi Dawud, 2492
sahih· Al-Albani

Umm Sulaim Al Rumaisa said “The Prophet(ﷺ) slept and awoke while she was washing her head.” He awoke laughing. She asked “Messenger of Allaah(ﷺ) 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.

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 ‏.‏

References2 variants
In-Book Reference
Book 15, Hadith 16
English Reference
Book 14, Hadith 2486