My S6 edge, edges lit up a weird blue colour?

So I put my phone on charge and faced it down on the floor started to go to bed and my room lit up looked straight at my phone and it was like there was a screensaver on but I don't have one. I unplugged the phone restarted it and it happened again I was quick enough to pick it up this time and the two edges had little up blue like blue screen on pc and within a second the phone went normal this has happened before but I thought it was nothing. If anyone has any ideas please reply
Thanks L.

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