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I do not think you can do that without rooting.
Yeah had the same problem. Sadly that cannot be turned off, I hope they will enable option for that in next update.
For now I just put the phone with screen down and with top edge turned in other direction than me. Does the job, can sleep again 
maybe light flow app can control that
why don't you turn it face down? that way the light won't lit up the whole room
This is so annoying, keeps me awake at night. 