The Prophet ﷺ once said:

"Our Lord Almighty descends to the lowest heaven in the last third of every night, saying: Who is calling upon Me that I may answer him? Who is asking from Me that I may give him? Who is seeking My forgiveness that I may forgive him?"

While the world sleeps, there is a sacred window when the veil between you and Allah feels unclouded. Your dua at that hour carries weight that dua at other times does not.