I do have exceptions set, favourite contacts only and alarm. What do you mean by set a 5 DnD schedule?
I know the exceptions work as I woke this morning at 5am because I got a messenger notification and my DnD was off even though it was set to turn off at 7am. When I checked my notifications, I had other messenger notifications from 11/12 last night that did not sound through the night, so DnD silenced these as it should. It seems it turns itself off around 5am.
Date and time is set automatically in settings, I will try and set this manually, but I don't think this is the cause as DnD comes on at 8pm as per schedule, its just turning off earlier that set 😴 and I'm getting woken up! Ha