Batalnya wudhu: tali pantat adalah kedua mata, maka barangsiapa yang tidur, hendaklah dia berwudhu
Imam Malik : 34و حَدَّثَنِي عَنْ مَالِك عَنْ زَيْدِ بْنِ أَسْلَمَ أَنَّ عُمَرَ بْنَ الْخَطَّابِ قَالَإِذَا نَامَ أَحَدُكُمْ مُضْطَجِعًا فَلْيَتَوَضَّأْ
It was narrated to me by (someone) from Malik, from Zayd ibn Aslam, that 'Umar ibn Al-Khattab said: "If any of you sleeps lying down, let him perform ablution.