Muwatta Imam Malik Book of Tahajjud, Hadith 18

Yahya related to me from Malik that he had heard that A'isha, the wife of the Prophet ﷺ used to say, "If someone fears that he will sleep through till the morning, let him pray the witr before he sleeps, and if some one hopes to wake for the last part of the night, let him delay his witr."

وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ ﷺ كَانَتْ تَقُولُ مَنْ خَشِيَ أَنْ يَنَامَ حَتَّى يُصْبِحَ فَلْيُوتِرْ قَبْلَ أَنْ يَنَامَ وَمَنْ رَجَا أَنْ يَسْتَيْقِظَ آخِرَ اللَّيْلِ فَلْيُؤَخِّرْ وِتْرَهُ .