Authentic Supplication Number 38.
The Messenger of Allah said: “Whoever retires to his bed in a state of taharah [maintaining ablution]… no time span of the night would pass in which he was asking Allah for Good of this Worldly Life, or that of the Hereafter except that Allah would grant him it”.
Reported by At-Tirmithi and he said it was a strange-comely hadeeth. A strange hadeeth is one that is reported by only one person at one one or more of the links in its chain of ascription. Al-Albani said it as At-Tirmithi said, or better, sighting testimonials for it by way of a number of companions. It is included in the Authentic of Good Sayings as #36.