My xperia z tablet has a really bright LED that flashes when it is in standby (that is when the screen is blank). In fact I am not sure it does it all the time but it is very annoying if it is in the room at night. Is there any way to stop this from happening?

My Xperia Z tablet has a really bright LED that flashes when it is in standby (that is when the screen is blank). In fact, I am not sure it does it all the time, but it is very annoying if it is in the room at night. Is there any way to stop this from happening?