Apple has confirmed that it is working to fix an issue that causes some iPhone alarms to go silent after users who fell asleep raised the issue on social media.

Built into the device's Clock app, the alarm is the preferred wake-up tool for many iPhone users.

However, in recent days, many iPhone users have reported that their alarms are not going off, causing them to be late for work and school.

Apple confirmed that it is aware of the issue and said it is working to fix it quickly.

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IT IS NOT KNOWN WHERE THE BUG ORIGINATED

It remains unclear how many people are affected, what may have caused the problem, or what users can do to fix it.

It's also not confirmed whether the bug is limited to specific iPhone models or a specific version of iOS software.

Users are also encouraged to double-check their alarms before going to bed to make sure the settings are correct and the volume is turned up.