Notifications help

[Addeheed]

Whenever I get a new message on Facebook I do not receive audio notifications while my Phone is locked, The Phone vibrates most of the time and I get led-lights. I get audio while my Phone is unlocked though. Anyone know why this happens? Thanks~

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[B. Diddy]

Welcome to Android Central! Which phone? Does it have any kind of mute or silent option while asleep? Some phones have an option to mute notifications if you place the phone screen down on a surface.