The night of qadr is the most virtuous night of the year.  Allaah says in the Quran (what means):“We revealed it on the night of power [that is, qadr]." 

"What will tell you what the night of power is? It is better than a thousand months” [97:1-3] Any action, for example, reciting the Quran, making remembrance of Allaah, and so on, on the night of qadr is better than the same act performed for one thousand months.