Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
abudawud:4146ʿUthmān b. Abū Shaybah And ʾAḥmad b. Manīʿ > Abū Muʿāwiyah > Hishām b. ʿUrwah from his father > ʿĀʾishah

The pillow of the Messenger of Allah ﷺ on which he slept at night (according to the version on Ibn Mani') was of leather stuffed with palm fibre (according to the agreed version).  

أبو داود:٤١٤٦حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ وَأَحْمَدُ بْنُ مَنِيعٍ قَالاَ حَدَّثَنَا أَبُو مُعَاوِيَةَ عَنْ هِشَامِ بْنِ عُرْوَةَ عَنْ أَبِيهِ عَنْ عَائِشَةَ ؓ قَالَتْ

كَانَ وِسَادَةُ رَسُولِ اللَّهِ ﷺ قَالَ ابْنُ مَنِيعٍ الَّتِي يَنَامُ عَلَيْهَا بِاللَّيْلِ ثُمَّ اتَّفَقَا مِنْ أَدَمٍ حَشْوُهَا لِيفٌ