The Prophet (ﷺ) was never more regular and particular in offering any Nawafil than the two rak`at (Sunna) of the Fajr prayer.
Sahih al-Bukhari Book 19, Hadith 42
← Previous Hadith After offering the two rak`at (Sunna) the Prophet (p.b.u.h) used to talk to me, if I happen to be awake; otherwise he would lie down.

Sahih al-Bukhari Book 19, Hadith 41 Next Hadith → Allah's Messenger (ﷺ) used to offer thirteen rak`at in the night prayer and on hearing the Adhan for the morning prayer, he used to offer two light rak`at.

Sahih al-Bukhari Book 19, Hadith 43