My iphone does not automatically switch off the display light when locked. How do I fix this?

I have an iPhone 5 with iOS 8.2 software.
My iPhone does not automatically switch off the display light when it is locked. Therefore, if I get an e-mail/text message/pop-up from other application, the light just stays on, which obviously drains my battery.
The problem just started yesterday, and it has been a couple of days since I updated the software, so I wouldn't think the software update is the problem.
I have tried restarting the phone (using home and lock button), but that did not work.
Something else that seems weird is that once in a while, a blue beam rolls over the screen from one side to the other. I don't know why it does this, and have no idea whether this is related to the display light issue.
I hope someone is able to help by telling me what to do in order to get my phone to act normal again.
Thank you x

Restart your device by holding the home and power button until the Apple logo appears. You will not lose any data.

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