Yes. Just make sure to lock your phone after setting the alarm, since DND only works when the phone is locked.
Important: Your incoming messages will always be muted when Sleep Cycle is used in the background and without Airplay (only available when using motion detection accelerometer) set to On. Keep Sleep Cycle in the foreground without locking the phone and activate Airplay in Settings> Airplay if you want your incoming messages to sound.
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