My Ipad Pro Is Allowing Facetime Calls Even Through Scheduled Do Not Disturb Is Turned On

Hi, I have an ipad pro (12.9 inch) 3rd generation running software version 13.5.1

I have do not disturb scheduled at night from 12 am to 12 pm. It silences all notifications but it is not silencing my Facetime. I have received an accidental facetime call that rang with the ringtone and woke me up at 4:30 am. What can I do so this doesn't happen again. I wish to receive facetime calls from this number in the daytime but not at that time. Thanks for your help.