The Sunnah method of sleeping whilst on a journey
40.) When Nabi (Sallallaahu ‘alayhi waSallam) was on a journey, he would sleep on his right side as usual if he camped during the early part of the night. However, if he (Sallallaahu ‘alayhi waSallam) camped during the latter part of the night, he would keep his forearm upright and place his head in his palm.
[Hazrat Abu Qatadah (RA) - Sahih Muslim]
- This manner was adopted to ensure that a deep sleep did not overcome him, thereby endangering the Fajr Salaah.
Extracted from Ash-Shamaa`il al Kubra
[The Sublime Conduct of Nabi (Sallallaahu ‘alayhi waSallam) Volume 3]