Alarm alert is not missing even battery is low. Android Tips and Tricks by Topper Guru.

No worry it your battery is low. You will not miss your alarm. Yes, when your device is at rest, Doze automatically puts it into a sleep state.
So your phone can still set off your alarm in the morning even if you forgot to charge it. It is a great feature of Android which takes care of this for you. It is amazing that Doze mode is an automatic and worthy feature of Android 6.0 Marshmallow OS. So, you need not worry about it.

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:: Topper Guru ::