question #1 Sahih Muslim 758e, Book 6, Hadith 205 : What is the significance of the last part of the night in Islamic tradition for seeking forgiveness and mercy?

Allah waits till when one-third of the first part of the night is over; He descends to the lowest heaven and says: It there any supplicator of forgiveness? Is there any penitant? Is there any petitioner (for mercy and favour)? Is there any solicitor? -till it is daybreak.