A voluntary Night prayer of odd numbers Rakats
وَالشَّفْعِ وَالْوَتْرِ {3}
(I Swear) the even and the odd [89:3]
مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ سِنَانٍ عَنِ ابْنِ مُسْكَانَ عَنِ الْحَلَبِيِّ قَالَ سَأَلْتُ أَبَا عَبْدِ اللَّهِ ( عليه السلام ) عَنِ صَلَاةِ اللَّيْلِ وَ الْوَتْرِ فِي أَوَّلِ اللَّيْلِ فِي السَّفَرِ إِذَا تَخَوَّفْتُ الْبَرْدَ وَ كَانَتْ عِلَّةٌ فَقَالَ لَا بَأْسَ أَنَا أَفْعَلُ ذَلِكَ
Mohammed ibn Yahya has narrated from Ahmad ibn Mohammed from Mohammed ibn Sinan from ibn Muskan from al-Halabiy, who has said the following:
‘I once asked Abu’ Abd Allah-asws about nightly Salat and al-Witr in the beginning of the night on a journey if one is afraid of cold or not feeling well. The Imam-asws said: ‘It is not harmful and I do it so.[1]
[1] الكافي (ط – الإسلامية)، ج3، ص: 441, H. 10