" إِذَا نَعَسَ الرَّجُلُ وَهُوَ فِي الصَّلاَةِ فَلْيَنْصَرِفْ لَعَلَّهُ يَدْعُو عَلَى نَفْسِهِ وَهُوَ لاَ يَدْرِي "
It was narrated that Aishah said: "The Messenger of Allah (ﷺ) said: 'If a man feels drowsy when he is praying, let him stop, lest he supplicate against himself without realizing.'"