'Aishah (May Allah be pleased with her) reported:
The Prophet (ﷺ) used to offer eleven Rak'ah of optional Salat (prayers) in the latter part of night. When it was about dawn, he would offer two short Rak'ah and then would lie down on his right side till the Mu'adhdhin (one who calls for prayer) would come to inform him that the congregation had gathered (for prayer).[Al-Bukhari and Muslim].
App reference: Book 5, Hadith 3
Arabic/English book reference: Book 5, Hadith 816