وعن أبي أمامة رضي الله عنه
قال: قيل لرسول الله صلى الله عليه وسلم: أي الدعاء أسمع؟ قال: «جوف الليل الآخر ودبر الصلوات المكتوبات»
The Messenger of Allah (sallallahu alayhi wa sallam) was asked: “At what time does the supplication find the greatest response?” He (sallallahu alayhi wa sallam) replied, “A supplication made during the middle of the last part of the night and after the conclusion of the obligatory prayers.”.
Riyad as-Salihin 1500, Book 17, The Book of Du'a (Supplications), Hadith 36. 1 min read