وَذَلِكَ لِأَنَّهُ يمِيل بالفضول إِلَى خلف فيحتبس عَن مجاريها الَّتِي هِيَ إِلَى قُدَّام مثل المنخرين والحنك وَالنَّوْم على الإستلقاء من عَادَة الضعفى من المرضى لما يعرض لعضلاتهم من الضعْف ولأعضائهم فَلَا يحمل جنب جنبا بل يسْرع إِلَى الاستلقاء على الظّهْر
because the effete matters then tend to accumulate in the tissues of the back, where they are held and prevented from entering the natural channels which are in front, like the nostrils and palate. Persons who are accustomed to sleep on their backs often become debilitated, for their muscles and members become weakened; also because one side cannot alternate with the other, seeing that such persons quickly return to the supine position