Tahajjud prayer is part of the Sunnah of the Prophet (peace and blessings of Allah be upon him) which Muslims should follow all the time; it’s not something confined to Ramadan.Performing Tahajjud prayer and following it with du`aa’ is recommendable and greatly rewarded by Allah. The eminent Muslim scholar and renowned Da`iyah, Sheikh `Abdel Khaliq Hasan Ash-Shareef, states: “There is no specific du`aa’ to be said after Tahajjud Prayer. One can make du`aa’ with any words he memorizes and preferably use the reported prophetic du`aas (supplications). Ask Allah while believing that He will answer your du`aa’. And never ask Allah with something sinful or severing the ties of kinship.
May Allah grant every Muslim Paradise and happiness in this worldly life and in the Hereafter, amen!”