If your phone's silent switch is on, the phone won't make noise no matter how Do Not Disturb is set.

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"The turbines in an evening will be sending out a noise map of 30dB to 55dB, that will begin to disturb sleep for people, " said Mr Fitzpatrick.

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Take some steps to prevent a repeat performance: Install a lock on your bedroom door, encourage kids to knock, play soft music or the TV for white noise at night, and schedule "private parent time" when your child knows not to disturb you.

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