It is narrated from Hazrat Amr bin Umayyah (may Allah be pleased with him) that once we were on a journey with the Noble Prophet (peace and blessings be upon him). The Noble Prophet (peace and blessings be upon him) slept at the time of Fajr, and no one woke up until the sun had risen. Then the Noble Prophet (peace and blessings be upon him), making up for it, first performed the two Sunnah (units), then established the prayer and led the Fajr prayer.