Screen stays on during sleep, device completely awake

I have a weird problem. I went to bed with 64% battery and woke up 4-5 hours later with 42%. I checked my stats and saw that for the duration of my sleep (while probably in Doze mode) the screen was 100℅ on and the device 100% awake.

Is this a known issue or am I the first? I always put the notification slider to priority during sleep. See attached screenshots.

Attached Thumbnails

     

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