(24) باب مَنْ تَحَدَّثَ بَعْدَ الرَّكْعَتَيْنِ وَلَمْ يَضْطَجِعْ
Narrated `Aisha:
After offering the Sunna of the Fajr prayer, the Prophet (ﷺ) used to talk to me, if I happen to be awake; otherwise he would lie down till the Iqama call was proclaimed (for the Fajr prayer).
Reference: Sahih al-Bukhari 1161
In-book reference: Book 19, Hadith 40
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 21, Hadith 258