CrimsonedSwordsman
Good day, 2 culprits that come to mind that would need further testing:
Compare how far the battery discharges overnight under the following conditions and record your findings.
Test 1) normal night--no changes.
Test 2) overnight with airplane mode on, turn on bluetooth and/or wifi if you need it
Test 3) airplane mode off & turn Off GPS/location via the quick tile or settings > location > very top is the off toggle
You can do some further investigating on battery usage. Review the last half of this comment talking about battery usage:
#3383411
Let us know any of your findings. :)