Hadith 1106
The freed slave of the Messenger of Allah (ﷺ), Sayyiduna Thawban (may Allah be pleased with him), narrates that we were on a journey with the Messenger of Allah (ﷺ). He (ﷺ) said: "Indeed, this journey is a cause of hardship and fatigue, so when any one of you has prayed Witr, let him (also) pray two (additional) rak‘ahs. Then if he wakes up (for Tahajjud, it is better), otherwise those two rak‘ahs will suffice for him."