Masruq reported on the authority of 'A'isha that she said that the Messenger Of Allah ﷺ used to observe the Witr prayer every night, maybe in the early part of night, at midnight and in the latter part, finishing his Witr at dawn. (Using translation from Muslim 745b)
مِنْ كُلِّ اللَّيْلِ قَدْ أَوْتَرَ رَسُولُ اللهِ ﷺ مِنْ أَوَّلِهِ وَأَوْسَطِهِ وَآخِرِهِ فَانْتَهَى وِتْرُهُ إِلَى السَّحَرِ