Abu Mijlaz narrated that Ibn ‘Umar said:
“The Messenger of Allah (ﷺ) said: ‘Night prayers are to be offered two by two, and Witr is one Rak’ah.’ I said: ‘What do you think if I become drowsy and I want to sleep?’ He said: ‘Put “what do you think” up there with that star? (i.e., don’t think about it at all).’ I raised my head and saw As- Simak.* He repeated that the Messenger of Allah (ﷺ) said, ‘Night prayers are to be offered two by two, and Witr is one Rak’ah, before dawn.’”