Yahya related to me from Malik from Nafi that one time Abdullah ibn Umar fainted and lost his senses and he did not make up the prayer.
Malik commented, "We consider that that was because, and Allah knows best, the time had passed. Someone who recovers within the time has to pray."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، أُغْمِيَ عَلَيْهِ فَذَهَبَ عَقْلُهُ فَلَمْ يَقْضِ الصَّلاَةَ . قَالَ مَالِكٌ وَذَلِكَ فِيمَا نَرَى - وَاللَّهُ أَعْلَمُ - أَنَّ الْوَقْتَ قَدْ ذَهَبَ فَأَمَّا مَنْ أَفَاقَ فِي الْوَقْتِ فَإِنَّهُ يُصَلِّي .