Yes, your alarm will still go off even if your iPhone is in "Do Not Disturb" mode. In "Do Not Disturb" mode, only calls, messages, and other notifications are suppressed, but your alarms will still sound as normal. If you don't want to be disturbed at night by any noises or vibrations, you can turn on "Bedtime" mode in the Clock app. This will turn on "Do Not Disturb" automatically and mute all incoming calls and notifications until your designated wake-up time.
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