iPod 5th generation Running iOS 9.3.5 My email notification sound keeps going off and there's no new or unread mail. I confirm this every time by checking my mail on my iPod then on my iPhone as well. When this happens there's no notification on my iPhone because there is no mail actually coming in. I wouldn't really care only this seems to only happen in the middle of the night and the do not disturb doesn't catch it. It comes through regardless of the do not disturb being on, and this wakes me up repeatedly.