Professor Sheikh Ali Akbar Tehrani says:

The best worship which we could do in Qadr nights are as follows:

1- Stay awake, even if not doing worship, the reward of worship is recorded for man. However, we should be careful not to commit backbiting. 

2- We should count our sins from the early birth up to the present and repent of them.

3- Do good practices like saying the prayers of Laylato-al-Qard and reciting Salavat.