Dalil
العربية

Quran Al-Muzzammil 73:6

إِنَّ نَاشِئَةَ ٱلَّيۡلِ هِيَ أَشَدُّ وَطۡـٔٗا وَأَقۡوَمُ قِيلًا

Translation

Indeed, the hours of the night are more effective for concurrence [of heart and tongue] and more suitable for words.