Authentic Supplication Number 048.

The Messenger of Allah  said: "The closest the Lord is to the bondservant is in the midst of the latter part of the night. So if you are able to be among those that establish remembrance of their Lord at that hour, then be".

Reporters.
Reported by At-Tirmithi, and he said it was comely-sound. Al-Albani said that 'Al-Hakim said that it was sound according to Muslim's conditions, and that Ath-Thahabi agreed with him, and that the hadeeth is as they have said. Al-Albani included it in The Authentic of Good Sayings as #42.