Zaid b. Aslam reported God’s Messenger as saying, “If any of you oversleeps and misses his <i>witr</i>, he should observe it in the morning.” Tirmidhi transmitted it in <i>mursal</i> form.

وَعَنْ زَيْدِ بْنِ أَسْلَمَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَنْ نَامَ عَنْ وَتْرِهِ فَلْيُصَلِّ إِذَا أَصْبَحَ» . رَوَاهُ التِّرْمِذِيُّ مُرْسلا