I noticed in battery section in samsung is inacurate. I had unplugged my phone from charger and I woke up after 5 hour more, probably even almost 6 hrs. I checked the battery information and it said there I had like 4 hrs screen off time since it was full charged.
They are sad that they unplugged their phone from the charger & slept for 5 or 6 hours, but the device is saying that effectively, they only slept for 4 hours, ie: the screen off time is an hour, or 2 hours off from what they were expecting to see.
To answer the OP's question, it does not make sense, unless there was an app that was waking the screen for around an hour or more, while you were sleeping.. which is extremely unlikely.
You could try Clearing BOTH Cache & Data for Device Care, as well as Wipe Cache from Recovery.
The only real way to Clear the Battery's "memory" is probably a Factory Reset...
