My Activity on Android shows activity while I'm sleeping

Registration date
Saturday January 12, 2019
Last seen
January 12, 2019

I'm trying to figure out if this happens regularly on an Android phone or if someone is going into my phone. I'm noticing activity at odd hours, like while I'm asleep. 10-12 attempts with my browser and other things like an app logged out of, and switched around, not as I always keep it. The app thing may have happened because I shut the phone off for the night, but the My Activity stuff is what's got me thinking maybe someone's playing with my phone? Does anyone know if the My Activity keeps going on it's own even when we're not using it?
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