What is mentioned about
the obligation of Salat-ul-Duha for those who did not offer Witr after `Isha' Prayer is not correct. However, it is recommended for a Muslim to keep up the Witr after `Isha' Prayer if they become sleepy and may not wake up before the Fajr (Dawn) Prayer. If a person thinks they will be able to wake up before dawn to offer Tahajjud (optional late night Prayer), it is best to delay Witr until the last part of night. If they miss the supererogatory Salah which they used to offer at night, it is preferable to offer it in the morning before noon, but as Shaf` (two units of Prayer, particularly before the final unit of the odd-number prayer). For example, if a person usually offers five Rak`ahs (units of Prayer) at night, they should offer six Rak`ahs, performing Taslim (salutation of peace ending the Prayer) after each two Rak`ahs, and so on. It is authentically reported in the Hadith narrated by
`Aishah (may Allah be pleased with her) from the Prophet (peace be upon him) which proves this.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.