This Hadith throws light on the Prophet's night prayers (Tahajjud), that is, it comprised thirteen Rak'ah including three Rak'ah of Witr. It is also reported in Al-Bukhari on the authority of 'Aishah (May Allah be pleased with him) that Messenger of Allah (PBUH) would always perform thirteen Rak'ah in the Tahajjud prayer. This Hadith further tells us that after his midnight prayer, the Prophet (PBUH) would perform two Rak'ah of Sunnah (i.e., after the Adhan of Fajr prayer) and then lie down on his right side. This practice of Messenger of Allah (PBUH) is an established fact.