51:17
كَانُوا۟ قَلِيلًا مِّنَ ٱلَّيْلِ مَا يَهْجَعُونَ
kānū qalīlan mina al-layli mā yahjaʿūna
They used to sleep but little of the night,
— Saheeh International
sleeping only little at night,
— M. A. S. Abdel Haleem
They used to sleep but little by night [invoking their Lord (Allâh) and praying, with fear and hope].
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali