[android help] Awake phone from sleep with chronometer timer

I am making an interval timer for a stopwatch APP, and I'm using chronometer to display notifications (Run, walk, stop) and play sound. But when the phone is in sleepmode it doesn't do anything.

Is there a way to wake up the phone, to show these notifications (and play the sound), or must I use AlarmManager?

I know how to make the phone stay awake with wakelock and FLAG_KEEP_SCREEN_ON, but I don't know how to awake it from sleep.

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