Delayed notifications overnight?

This morning when I woke up I picked up a my phone and saw that I had no notifications on either the Always On screen or the home screen when I turned it on. Then 2 or 3 seconds later I have 2 email notifications at the same time. I looked at the times they were sent and they were sent a few hours earlier. I am not positive, but I think that the same thing happened the day before, but I wasn't really paying attention to the times of the emails.

What's causing this?

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