Praying Qiyaam (night prayer):

It is recommended to make a long qiyaam prayer during the nights on which Laylatul Qadr could fall. This is indicated in many ahadeeth, such as “Whoever stands (in qiyaam) in Laylatul Qadr [and it is facilitated for him] out of faith and expectation (of Allah’s reward), will have all of his previous sins forgiven.” [Al-Bukhari and Muslim; the addition “and it is facilitated for him” is recorded by Ahmad from the report of ‘Ubaadah Bin as-Samit; it means that he is permitted to be among the sincere worshippers during that blessed night.]