Narrated `Aisha: Allah's Apostle 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.
Hadith ReferenceSahih Bukhari / The Book of Salat-Ut-Tahajjud (Night Prayer) / Hadith: 1164
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة