(23) باب وَقْتِ قِيَامِ النَّبِيِّ صلى الله عليه وسلم مِنَ اللَّيْلِ
Anas b. Malik said (explaining the meaning of the Qur'anic verse "Who forsake their beds to cry unto their Lord in fear and hope, and spend of what We have bestowed on them" (32:
16). The people used to remain awake between the sunset and the night prayers and would pray. Al-Hasan used to say: (This verse means) the prayer and vigil at night.
Reference: Sunan Abi Dawud 1321
In-book reference: Book 5, Hadith 72
English translation: Book 5, Hadith 1316