Mukhtasar Muslim (Abridged) 361 — Lying down after Fajr Sunnah

Umm al-Mu'mineen Aisha Siddiqa (may Allah be pleased with her) says: When the Prophet Muhammad (peace and blessings be upon him) finished offering the Sunnah of Fajr, if I was awake, he would talk to me, otherwise he would lie down.