Prophet Muhammad (Sallahu'Alayhi Wassallam) said, "Our Lord, the Blessed, the Superior, comes every night down on the nearest Heaven to us when the last third of the night remains, saying: "Is there anyone to invoke Me, so that I may respond to invocation? Is there anyone to ask Me, so that I may grant him his request? Is there anyone seeking My forgiveness, so that I may forgive him?"

[Bukhari, Book 2, Volume 21, Hadith 246 ], [Muslim, Book 4, Hadith 1656]

So instead of doing, Ibadah on one particular night, get in the habit of worshipping every night. Because Allah hears your call every night infact all the time. To know more regarding Shab-e-barat or 15th Of Shaaban, read this article -http://blog.iloveallaah.com/?p​=474