The Messenger of Allah ﷺ's sleeping mat was made of leather stuffed with palm fibers.
حدثنا ابن نمير حدثنا هشام عن أبيه
كان ضجاع رسول الله ﷺ من أدم حشوه من ليف
No references are available.
Its chain of transmission is sahih, and it was mentioned previously at 24091.