(An-Naba') 78 : 10
وَجَعَلْنَا اللَّيْلَ لِبَاسًا
And didn’t We make the night a Cloth?
That means it is possible to sleep at night without wearing a dress. Through verse 24: 58, couples are allowed to be naked at three times. See explanation 2: 187; 4: 23; and 23: 7.