I am having a little problem with the notification LED on the Sony Xperia M4 Aqua. I think it's probably a Sony thing.
I come from an S4 and I relied on the LED blinking to see what kind of notification I had a lot.
I keep my phone on silent with no vibration because otherwise I'd be hearing buzzes and sounds every 5 seconds and I could know at a glance if I had a message on Facebook etc.
This Sony phone has a LED that's not as bright and big as the Samsung one and it seems to blink when it feels like it. If it blinks, it's not very fast so I have to be looking at the phone for a while to actually see it blinking. I tried a couple of paid apps to control the notification lights but it didn't really seem to make a difference so got a refund and uninstalled them.

Is there anything I can do? Is that how Sony phones work?