Default Battery concern

I'm feeling like something is wrong here. Idk maybe its me.

When I check my battery usage I see android OS taking up some battery. Clicking on it reveals a CPU total of 18 mins and a keep awake total of 4 hrs. I have a DS emulator installed that I play often but I don't think that its keeping the phone awake if I close it out and not play it. I have a better battery screenshot attached.Click image for larger version

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