The Companions (may Allah be pleased with them) used to devote attention to the Prophet's guidance in his deeds, words, and approvals, to follow his example and learn from him. In this Hadīth, Abu Qatādah (may Allah be pleased with him) says that when the Messenger of Allah (may Allah's peace and blessings be upon him) went on a journey, he would alight in the first part of the night for sleep and rest, sleep on his right side, and place his head on a pillow or the like, thus giving himself the due share of sleep. And when he wanted to sleep at the latter part of the night, shortly before dawn, he would erect his right 'forearm' and "place his head on his palm," fearing he might be overtaken by sleep and thus fail to perform the Fajr prayer at its earliest time. The right side is favored regarding sleep given the honor of tayāmun (using the right side or starting with it) and its general merit in everything. It was the Prophet's habit to favor the right side, except in repulsive things, in which he would use the left side. This also indicates that a person should give himself the due share of rest and not forget the worship of his Lord. In the first part of the night, he can get sufficient sleep before dawn and then get up. Yet in the latter part of the night, he should sleep lightly, rather than deeply, lest he may miss the Fajr prayer. In the Hadīth: Alighting for rest during travel in case of tiredness, while being cautious not to miss the prayer And in it: Using alarms and the like to alert one to the times of prayers.