question #2 Sahih Muslim 754a, Book 6, Hadith 193 : When is the recommended time to perform the Witr prayer?

Observe Witr prayer before it is morning. Abu Sa’id reported that they (the Prophet’s Companions) asked the Messenger of Allah (ﷺ) about Witr (prayer). (In reply to their inquiry) he said: Observe Witr prayer before it is morning.