Which direction should one face while sleeping

Narrated Umm Salamah, Ummul Mu'minin:

Some relative of Umm Salamah said: The bed of the Prophet ﷺ was set as a man is laid in his grave; the mosque was towards his head.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا حَمَّادٌ، عَنْ خَالِدٍ الْحَذَّاءِ، عَنْ أَبِي قِلاَبَةَ، عَنْ بَعْضِ، آلِ أُمِّ سَلَمَةَ قَالَ كَانَ فِرَاشُ النَّبِيِّ ﷺ نَحْوًا مِمَّا يُوضَعُ الإِنْسَانُ فِي قَبْرِهِ وَكَانَ الْمَسْجِدُ عِنْدَ رَأْسِهِ .