In which Sun has a panic attack and Y/N tries their best to help.
Sun and Moon do not share the same memory pool, if they are "sleeping" when the other is active they do not automatically know what happened in that time. Though they do usually tell eachother everything imidiatly after "waking up". They often stay awake when the other is active though to keep eachother company.
But yea seems like Moon was the last one active before, well, whatever happened to them, while Sun had a lil nap.