Not offering Witr at the last part of the night in case of already offering it at the first part of it

Q 7: The Prophet (peace be upon him) said: Make Witr (odd prayer) your last prayer at night. What should one do if he offered witr (Prayer with an odd number of units) at the beginning of the night then he wanted to offer Qiyam-ul-Layl (optional Prayer at night) during the last part of the night?

A: If a person offers Witr at the beginning of the night and he woke up during the last portion of the night, then he is permitted to offer supererogatory prayers as he wishes without repeating Witr. However, if he is sure of his awakening during the last portion of the night, he should delay the Witr until the last part of the night, as this is preferable as the Prophet (peace be upon him) indicated by his saying: Make Witr (odd prayer) your last prayer at night. (Agreed upon by Al-Bukhari and Muslim).May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.