question #3 Sahih Muslim 722, Book 6, Hadith 105 : Why is it important to perform the Witr prayer before sleeping, as advised by the Prophet (ﷺ)?

My Friend (ﷺ) instructed me in three (acts), and I would never abandon them as long as I live. (And these three things are): Three fasts during every month, the forenoon prayer, and this that I should not sleep till I have observed the Witr prayer.