Al-Amālī
Hadith 7327 - ثم قال علي (عليه السلام): كان فراش رسول الله (صلى الله عليه وآله) عباءة، وكانت مرفقته أدم، حشوها ليف، فثنيت له ذات ليلة، فلما أصبح قال: لقد منعني الفراش الليلة الصلاة، فأمر (صلى الله عليه وآله) أن يجعل بطاق واحد (4).
Also, `Ali (as) said: The bed of the Messenger of Allah (s) was a cloak. His furnishing was mud. His padding was fibre. I folded [his bed] for him one night [to double its thickness], and when he awoke in the morning, he said: “The bed had prevented me from the night prayer.” So, he (s) ordered that he [only] be given a single layer.