Tafsir of An-Naba' 78:10

And We have made the night as a covering, meaning, its shade and darkness covers the people. This is as Allah says,

واليل إذا يغشها

By the night as it conceals it. (91:4) Qatadah commented;

وجعلنا اليل لباسا

meaning, a tranquil residence. Concerning Allah's statement,

وجعلنا النهار معاشا