(19) Jihad
كتاب الجهاد
(3c) Chapter: Conduct while Traveling - Section 3
(2) باب آداب السفر - الفصل الثالث
Mishkat al-Masabih 3922 
Abu Qatada told that when God's Messenger encamped at night on a journey he lay down on his right side, and when he encamped a little before morning he raised his forearm and placed his head on the palm of his hand. Muslim transmitted it.
عَن أبي قتادةَ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا كَانَ فِي سَفَرٍ فَعَرَّسَ بِلَيْلٍ اضْطَجَعَ عَلَى يَمِينِهِ وَإِذَا عَرَّسَ قُبَيْلَ الصُّبْحِ نَصَبَ ذِرَاعَهُ وَوَضَعَ رَأْسَهُ عَلَى كَفِّهِ. رَوَاهُ مُسلم
 صَحِيح  (الألباني)حكم :
Reference : Mishkat al-Masabih 3922
In-book reference : Book 19, Hadith 134