Prohibition of lying's on one's face
حَدَّثَنَا يَعْقُوبُ بْنُ حُمَيْدِ بْنِ كَاسِبٍ، حَدَّثَنَا سَلَمَةُ بْنُ رَجَاءٍ، عَنِ الْوَلِيدِ بْنِ جَمِيلٍ الدِّمَشْقِيِّ، أَنَّهُ سَمِعَ الْقَاسِمَ بْنَ عَبْدِ الرَّحْمَنِ، يُحَدِّثُ عَنْ أَبِي أُمَامَةَ، قَالَ مَرَّ النَّبِيُّ ـ صلى الله عليه وسلم ـ عَلَى رَجُلٍ نَائِمٍ فِي الْمَسْجِدِ مُنْبَطِحٍ عَلَى وَجْهِهِ فَضَرَبَهُ بِرِجْلِهِ وَقَالَ " قُمْ وَاقْعُدْ فَإِنَّهَا نَوْمَةٌ جَهَنَّمِيَّةٌ " .
It was narrated that Abu Umamah said: "The Prophet(ﷺ) passed by a man who was sleeping in the masjid, lying on his face. He struck him with his foot and said: 'Get up' or; 'Sit up, fo this is a hellish kind of sleep.'"