Surah Adh-Dhariyat 51:17

كَانُوا۟ قَلِيلًا مِّنَ ٱلَّيْلِ مَا يَهْجَعُونَ

They used to sleep but little of the night,

Translation: Saheeh International

Tafsir

Little of the night did they use to sleep mā is extra; yahja‘ūna is the predicate of kānū; qalīlan ‘little’ is an adverb in other words they used to sleep for a small portion of the night and perform prayers during most of it

Excerpt from Tafsir al-Jalalayn, commentary on 51:17, via Quran.com. The reader has the full commentary and 9 more tafsirs.