[Machine] The Messenger of Allah ﷺ used to place his right hand under his right cheek when he slept. His right hand was also used for his food, drink, purification, and water. His left hand was used for everything else.
كَانَ رَسُولُ اللهِ ﷺ «إِذَا أَخَذَ مَضْجَعَهُ جَعَلَ يَدَهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ وَكَانَتْ يَمِينُهُ لِطَعَامِهِ وَشَرَابِهِ وَطُهُورِهِ وَمَائِهِ وَكَانَتْ شِمَالُهُ لِمَا سِوَى ذَلِكَ»
[Machine] Regarding Hafsah, the wife of the Prophet ﷺ , she said: "When the Messenger of Allah ﷺ went to bed, he would place his right hand under his right cheek. His right hand was used for his food, purification, prayers, and clothing. As for his left hand, it was used for other purposes. He used to fast on Mondays and Thursdays."
عَنْ حَفْصَةَ زَوْجِ النَّبِيِّ ﷺ قَالَتْ كَانَ رَسُولُ اللهِ ﷺ إِذَا أَخَذَ مَضْجَعَهُ وَضَعَ يَدَهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ وَكَانَتْ يَمِينُهُ لِطَعَامِهِ وَطُهُورِهِ وَصَلَاتِهِ وَثِيَابِهِ وَكَانَتْ شِمَالُهُ لِمَا سِوَى ذَلِكَ وَكَانَ يَصُومُ الِاثْنَيْنِ وَالْخَمِيسَ
"When the Messenger of Allah would lie down, he would place his right hand under his right cheek, and he used to fast on Mondays and Thursday." (Using translation from Nasāʾī 2367)
«كَانَ رَسُولُ اللهِ ﷺ إِذَا أَخَذَ مَضْجَعَهُ جَعَلَ كَفَّهُ الْيُمْنَى تَحْتَ خَدِّهِ الْأَيْمَنِ»