This morning I woke up to a notification on my iPhone saying that the current screen recording session was stored to my camera roll. I didn't do any screen recordings lately (definitely not last night).
There was indeed a new recorded session in my camera role of about 17 seconds, dated to 4:56am this morning (I usually get up at around 5, but definitely didn't touch the phone prior to seeing the message).
In the recording, "someone" swiped down on my (apparently unlocked!) home screen (it is locked at night and is in airplane mode, just like last night), entered "mys" in the search bar, waited, deleted it, entered "dyn", waited, exited back to the home screen and then the recording stops. You can even see the airplane mode icon, meaning there was no remote connection possible. I recognize the home screen as my own in its current configuration.
Now what's bugging me: Let's assume I was sleep drunk and just can't remember doing all the above. The recording doesn't show the red bar it usually shows on my iPhone (SE) when recording sessions (I double checked right after). So even if someone should have sifted through my phone and accidentally turned on screen recording, the red bar should have been visible in the recorded session.
I'm on iOS 11.4.
I'm really lost here. I can't even see how someone should be able to pull off a prank on me, as there wasn't any internet connection available or anything. The phone is not jailbroken and never was. I bought it vanilla from Apple. I never noticed any other odd behavior on that device.
I appreciate any kinds of thoughts on this. I'm in a mixed state of curiosity, anxiety and confusion.