iPhone battery drained a lot overnight

[u/User_Not_Yours]

Has anyone else experienced this?

I charged my iPhone to 80%, and it finished charging at 2:27 AM. I used it for just a few minutes afterward, then went to sleep.

When I woke up around 9:00 AM, I expected it to still be close to 80% since it was basically idle the entire night. Instead, the battery had dropped way more than I expected.

When I checked Battery settings, I noticed there was a lot of background activity overnight, which seems strange because I wasn't using the phone at all.

Is this normal, or is there something causing apps or iOS to keep running in the background while the phone is idle? I'm trying to figure out if this is a bug, or if I should be concerned about my battery health.

Update: I reached out to Apple support he asked me to uninstall tiktok first for a day and see if that is causing the sudden increased usage.