(6) باب النَّوْمِ فِي الْمَسْجِدِ
It was narrated that Ibn 'Umar said:
"We used to sleep in the mosque at the time of the Messenger of Allah."
Reference: Sunan Ibn Majah 751
In-book reference: Book 4, Hadith 17
English translation: Vol. 1, Book 4, Hadith 751