Abdul Razzaq al-Badr said,
The Prophet (peace be upon him) slept only to provide his body with rest and thus he would not oversleep, sufficing with the amount of sleep that provided this. It is for this reason that he did not sleep upon luxurious mattresses or beds. This is because he had great targets to achieve in his lifetime, due to him being the Messenger of Allāh and the role model for mankind.
328. Aisha narrated: “The bed on which the Messenger of Allāh (peace be upon him) slept upon was made of leather stuffed with the fibre of palm trees.” [379]
Al-Qadī ‘Iyyād said,
This indicates the permissibility of pillows, sleeping pads and to have sleeping pads that are made of leather and stuffed.
Ibn al-Jawzī said,
Aisha narrated, “A woman from the Ansār visited me and saw that the pad on which the Prophet (peace be upon him) used to lie on was a folded robe so she left and returned with a pad filled with wool. The Messenger of Allāh (peace be upon him) came afterwards and saw it so he asked about it. I mentioned to him what happened so he told me to return it three times but as he saw that I liked it and wanted to keep it he said, ‘O Aisha, return it for by Allāh if I wanted, Allāh would have given me mountains of gold and silver.’”[380]
329. Muhammad al-Baqir narrated that someone asked Aisha [… to the end of the previous hadith] and then asked Hafsah: “How was the bed of the Messenger of Allāh (peace be upon him) in your house?” She replied: “It was a rough canvas made of wool folded into two, which was spread for him to sleep on. On one night we thought if we folded it into four and spread it, it would become more comfortable and so we folded it and spread it that way. In the morning, he asked, ‘What did you spread out for me last night?’ We replied, ‘It was your bed but we folded it into four so that it may become softer.’ He (peace be upon him) said, ‘Leave it in its original state. Its softness prevented me from praying the night prayers.’” [381]
‘Abdullāh ibn Sa’īd al-Hadramī said,
The Prophet (peace be upon him) thought that his sleeping pad was changed as he noticed it felt softer and he asked his wife to fold it into two layers (the manner in which he was accustomed to) because a softer bed can cause one to fall into deep sleep.