There is an hour during the night in which no Muslim individual will ask Allah for good in this world and the next without His giving it to him; and that applies to every night.
Sahih Muslim Book 6, Hadith 199
← Previous Hadith The Messenger of Allah (ﷺ) was asked about the prayer which was most excellent. He said: That in which the standing is longer. (This hadith is narrated by another chain of transmitters too.)

Sahih Muslim Book 6, Hadith 198 Next Hadith → I heard the Messenger of Allah (ﷺ) as saying: There is an hour during the night in which no Muslim bondman will ask Allah for good in this world and the next but He will grant it to him.

Sahih Muslim Book 6, Hadith 200