Is there a definite time for voluntary

Q 4: What is the best time for performing Qiyam-ul-Layl (optional Prayer at night) and reciting Qur'an during the night? I would like to determine the exact hour for doing this.

A: It is possible to perform Qiyam-ul-Layl at any time during the night. You are permitted to perform it during the first, middle or last part of the night. But the best time for doing so is the last third part of the night.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.