The Messenger of Allah ﷺ said, "There is an hour during the night in which no Muslim servant asks Allah for something good except that He grants it to him, and that occurs every night."
حدثنا ابن إدريس عن الأعمش عن أبي سفيان
قال رسول الله ﷺ إن في الليل لساعة لا يوافقها عبد مسلم يسأل الله فيها خيرا إلا آتاه إياه وذلك في كل ليلة
Its isnad is sahih, and it is found in Muslim 1/521 no. 757, in the book of the prayer of travelers, on the hour of the night when supplication is answered, and in Tabarani's Al-Saghir 2/309 no. 834, edited by Hout, and in Al-Kabir 9/46.