“The Prophet ﷺ said: ‘If anyone of you becomes drowsy, let him sleep until he feels refreshed, for he does not know, if he prays when he feels drowsy, he may want to say words seeking forgiveness but (instead) he ends up cursing himself.’”
قَالَ النَّبِيُّ ﷺ إِذَا نَعَسَ أَحَدُكُمْ فَلْيَرْقُدْ حَتَّى يَذْهَبَ عَنْهُ النَّوْمُ فَإِنَّهُ لاَ يَدْرِي إِذَا صَلَّى وَهُوَ نَاعِسٌ لَعَلَّهُ يَذْهَبُ يَسْتَغْفِرُ فَيَسُبُّ نَفْسَهُ