Do Not Disturb does not block alarms on most phones

Do Not Disturb silences calls, texts, and notifications, but alarms still ring on both iPhone and Android. The feature is designed to let you sleep or focus without interruption while keeping time-sensitive alerts active. If you set an alarm before turning on Do Not Disturb, or while it is on, that alarm will sound at the scheduled time.

This matters because many people turn on Do Not Disturb at night expecting their phone to be completely silent, then worry they will miss their morning alarm. The alarm will go off. You do not need to turn off Do Not Disturb to hear it.

The behavior is the same whether you use Do Not Disturb's scheduled mode (which turns on automatically at a set time) or set up it manually. Alarms bypass the setting on purpose.

Key Takeaways

  • Alarms sound during Do Not Disturb on iPhone and Android because the feature is designed to block notifications but allow time-critical alerts.
  • Timers and alarms are treated differently — alarms always sound, but timer notifications may be silenced depending on your phone's settings.
  • If an alarm does not sound, the problem is usually that the alarm was never set, the phone is in silent mode, or the volume is turned all the way down.
  • You can customize which contacts can reach you during Do Not Disturb, but this does not affect whether alarms ring.

How alarms work differently from notifications

Your phone treats alarms as a separate system from notifications and calls. When Do Not Disturb is on, it mutes incoming messages, emails, and notification sounds — but alarms are classified as system alerts, the same category as emergency calls. They bypass Do Not Disturb by design.

Timers work differently. A timer that goes off while Do Not Disturb is active will vibrate and show on your screen, but the sound may not play if your phone is set to silent mode. Alarms, by contrast, will produce sound even if your phone is in silent mode, as long as the volume is not turned all the way down.

This distinction exists because the phone assumes you set an alarm for a reason — to wake up, to remember a medication, to catch a flight. Notifications can wait. Alarms cannot.

What to check if your alarm does not sound

If you set an alarm and it did not ring, Do Not Disturb is almost certainly not the cause. Start by checking whether the alarm was actually saved. On iPhone, open the Clock app and look at the Alarm tab — you should see your alarm listed with the time and days it repeats. On Android, open the Clock or Alarms app and confirm the alarm is there and toggled on (the toggle should be colored or highlighted).

Next, check your phone's volume. Press the volume up button while your phone is unlocked and watch the on-screen volume indicator. If it shows a speaker with a line through it, your phone is in silent mode. Slide the silent/mute switch on the side of an iPhone (or use the volume settings on Android) to turn sound back on. Make sure the volume slider itself is not all the way down.

If the alarm is set and your volume is up, restart your phone. Alarms sometimes fail to trigger after a software update or if the Clock app has a glitch. Power off your phone completely, wait 10 seconds, and turn it back on.

Customizing Do Not Disturb without affecting alarms

Do Not Disturb has settings that let you control what gets through — but none of them silence alarms. On iPhone, go to Settings > Focus > Do Not Disturb and you can allow calls from specific contacts, allow repeated calls (when someone calls twice in three minutes), and choose which apps can send notifications. On Android, the options vary by phone, but Settings > Notifications > Do Not Disturb usually offers similar controls.

You can also set Do Not Disturb to turn on and off automatically. iPhone calls this a schedule; Android calls it a schedule or routine depending on your phone. You might set it to turn on at 10 p.m. and turn off at 7 a.m., for example. Your alarms will still sound during those hours.

If you want to allow calls from your family or partner while Do Not Disturb is on, add them to your allowed contacts. This does not change alarm behavior — it just means their calls will ring through instead of being silenced.

Silent mode versus Do Not Disturb

Silent mode and Do Not Disturb are two separate settings that work together. Silent mode (the physical switch on iPhone, or the setting on Android) mutes all sounds except alarms and timers. Do Not Disturb silences notifications and calls but does not affect the physical mute switch.

If your phone is in silent mode and Do Not Disturb is on, alarms will still ring — but they may ring more quietly or vibrate instead, depending on your phone's alarm settings. To may support your alarm rings at full volume, make sure your phone is not in silent mode and your volume is turned up.

On some Android phones, you can set an alarm to override silent mode entirely. Check your Clock or Alarms app settings to see if there is an option like "Alarm volume" or "Override silent mode".

Why your phone treats alarms this way

Phone makers designed alarms to bypass Do Not Disturb because missing an alarm has real consequences. If you oversleep and miss work, or forget to take medication, or miss a flight, the cost is much higher than the annoyance of a notification. Notifications can wait until morning. Alarms cannot.

This is also why alarms sound even when your phone is in silent mode — the assumption is that you set the alarm deliberately and need to hear it. The same logic applies to emergency calls and, on some phones, alerts from emergency services.

If you want your phone to be completely silent at night, you have two options: turn off all your alarms before bed, or use a physical alarm clock instead of your phone. Do Not Disturb alone will not give you complete silence if you have alarms set.

Frequently Asked Questions

Will my alarm ring if Do Not Disturb is scheduled to be on all night?

Yes. Scheduled Do Not Disturb does not affect alarms. If you set your phone to turn on Do Not Disturb at 10 p.m. and turn it off at 7 a.m., any alarm you set for 6:30 a.m. will ring at 6:30 a.m., even though Do Not Disturb is still active.

What if I want my phone completely silent at night but still have an alarm?

Turn on Do Not Disturb and make sure your alarm is set. Your alarm will ring and notifications will be silenced. If you want no sound at all, use a separate alarm clock or turn off your alarms before bed.

Does Do Not Disturb block emergency calls?

No. Emergency calls and calls from your favorite contacts (if you have allowed them) will ring through Do Not Disturb. Alarms, timers, and emergency alerts also bypass the setting.

Why did my alarm not go off even though I had it set?

Do Not Disturb is not the cause. Check that the alarm is actually saved in your Clock app, that your phone volume is turned up, and that your phone is not in silent mode. If those are all correct, restart your phone.

Can I make my alarm louder while Do Not Disturb is on?

Yes. Press the volume up button to increase the alarm volume. Do Not Disturb does not limit how loud your alarm can be — it only silences notifications and calls.