Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 198
Desirability of Lying down on one’s right side after the Sunnah of Fajr Prayer
1110.`Aishah (May Allah be pleased with her) reported: When the Prophet (sallallaahu alayhi wa sallam) had performed two Rak`ah before the Fajr prayer, he would lie down on his right side.
[Al-Bukhari].
1111. `Aishah (May Allah be pleased with her) reported: When the Prophet (sallallaahu alayhi wa sallam) finished the `Isha prayer, he would perform eleven Rak`ah before the Fajr prayer, concluding each two Rak`ah with Taslim (i.e., saying As-Salamu `Alaikum) and observing the Witr (odd) at the end. When the Mu’adhdhin finished proclaiming Adhan for the Fajr prayer and it was dawn, he would rise and perform two short Rak`ah, and then would lie down on his right side till the Mu’adhdhin came to (inform) him about Iqamah.
[Muslim].
1112. Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “When anyone of you has performed two of Sunnah before the Fajr prayer, he should lie down on his right side.”
[Abu Dawud and At-Tirmidhi].
AbdurRahman.Org 