Surah An-Naba 78:10

وَجَعَلْنَا ٱلَّيْلَ لِبَاسًا

And made the night as clothing.

Translation: Saheeh International

Tafsir

and made the night a cloak? to cover you with its darkness

Excerpt from Tafsir al-Jalalayn, commentary on 78:10, via Quran.com. The reader has the full commentary and 9 more tafsirs.