PROSTRATION OF THE PROPHET, praise and peace be upon him H 1194 "The Messenger of Allah, praise and peace be upon him, offered eleven units of prayer at night. Each prostration lasted as long as it would take a person to recite fifty verses. Before the dawn prayer he would offer two short units of prayer and then recline on his right side until the caller to prayer came to call him for the dawn prayer. " R 1194 Bukhari with a chain up to Lady Ayesha, wife of the Prophet, may Allah be pleased with her, Mother of Believers who related this.
1171- وعن عائشة رضي الله عنها : أنَّ رسول الله صلى الله عليه وآله وسلم كَانَ يُصَلِّي إحْدَى عَشْرَةَ رَكْعَةً - تَعْنِي في اللَّيلِ - يَسْجُدُ السَّجْدَةَ مِنْ ذَلِكَ قَدْرَ مَا يَقْرَأُ أحَدُكُمْ خَمْسِينَ آيَةً قَبْلَ أنْ يَرْفَعَ رَأسَهُ ، وَيَرْكَعُ رَكْعَتَيْنِ قَبْلَ صَلاَةِ الفَجْرِ ، ثُمَّ يَضْطَجِعُ عَلَى شِقِّهِ الأيْمَنِ حَتَّى يَأتِيَهُ المُنَادِي للصَلاَةِ . رواه البخاري .