51:17

كَانُوا قَلِيلًا مِّنَ اللَّيْلِ مَا يَهْجَعُونَ

Transliteration:

Kanoo qaleelan mina allayli ma yahjaAAoona

Word by Word:

They used to little of the night [what] sleep.

Translations:

they would lie asleep during but a small part of the night,

They were in the habit of sleeping but little by night,

They used to sleep but little of the night,

The used to sleep but little at night.

They used to sleep but little of the night,