Narrated Aisha: The Prophet used to pray eleven rak`at in the late part of the night, and when dawn appeared, he would offer two rak`at and then lie on his right side till the Muadhdhin came to inform him (that the morning prayer was due).
Hadith Referenceصحيح البخاري / كتاب الدعوات / 6310
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة