When the Messenger of Allah ﷺ did not pray at night because he was prevented from doing so by sleep- meaning, sleep overwhelmed him- or by pain, he would pray twelve rak'ahs during the day.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ إِذَا لَمْ يُصَلِّ مِنَ اللَّيْلِ مَنَعَهُ مِنْ ذَلِكَ نَوْمٌ أَوْ وَجَعٌ صَلَّى مِنَ النَّهَارِ ثِنْتَىْ عَشْرَةَ رَكْعَةً