'Aishah (May Allah be pleased with her) reported:
The Messenger of Allah (ﷺ) used to perform eleven Rak'ah (of Tahajjud) prayers at night. He (ﷺ) would prostrate so long as one of you might recite fifty Ayat (of the Qur'an). Thereafter, he would perform two Rak'ah before Fajr prayers and would lie down on his right side till the Mu'adhdhin would come and inform him about the time of (Fajr) prayer.[Al-Bukhari].
App reference: Book 9, Hadith 181
Arabic/English book reference: Book 9, Hadith 1171