Imaam Muhammad AI-Baaqir (may Allah be pleased with him) says that someone asked Ummul Mu'mineen 'Aisha (may Allah be pleased with her):
'How was the bed of Messenger of Allah ﷺ in your house?' She replied: 'It was made of leather, in which was filled the coir of the date palm'. Hafsah (may Allah be pleased with her) was asked how was the bed of Messenger of Allah ﷺ in your house? She replied: 'It was a canvas folded into two, which was spread for Messenger of Allah ﷺ to sleep on. On one night I thought if I folded it into four and spread it, it would become softer. I folded it and spread it that way. In the morning Messenger of Allah ﷺ asked: 'What did you spread for me last night? I replied: 'It was the same bed, I only folded it into four so that it may become softer'. Messenger of Allah ﷺ said: 'Leave it in its original form. Its softness deprived me of my prayers (tahajjud) at night'.

حَدَّثَنَا أَبُو الْخَطَّابِ زِيَادُ بْنُ يَحْيَى الْبَصْرِيُّ، قَالَ: حَدَّثَنَا عَبْدُ اللهِ بْنُ مَيْمُونٍ، قَالَ: حَدَّثَنَا جَعْفَرُ بْنُ مُحَمَّدٍ، عَنْ أَبِيهِ، قَالَ: سُئِلَتْ عَائِشَةُ،: -. وَسُئِلَتْ حَفْصَةُ، مَا كَانَ فِرَاشُ رَسُولِ اللهِ ﷺ فِي بَيْتِكِ؟ قَالَتْ: مِسْحًا نَثْنِيهِ ثَنِيَّتَيْنِ فَيَنَامُ عَلَيْهِ، فَلَمَّا كَانَ ذَاتَ لَيْلَةٍ، قُلْتُ: لَوْ ثَنَيْتَهُ أَرْبَعَ ثَنْيَاتٍ، لَكَانَ أَوْطَأَ لَهُ، فَثَنَيْنَاهُ لَهُ بِأَرْبَعِ ثَنْيَاتٍ، فَلَمَّا أَصْبَحَ، قَالَ: مَا فَرشْتُمْ لِيَ اللَّيْلَةَ قَالَتْ: قُلْنَا: هُوَ فِرَاشُكَ، إِلا أَنَّا ثَنَيْنَاهُ بِأَرْبَعِ ثَنْيَاتٍ، قُلْنَا: هُوَ أَوْطَأُ لَكَ، قَالَ: رُدُّوهُ لِحَالَتِهِ الأُولَى، فَإِنَّهُ مَنَعَتْنِي وَطَاءَتُهُ صَلاتيَ اللَّيْلَةَ.