Been following this thread since you first posted. Shadow figures in hallways are no joke - I had something similar back in 2019, kept appearing at the end of my corridor around 3am. Never got it on camera though so people thought I was losing it.
What gets me is the three nights in a row part. In a lot of NDE accounts I've read, people describe seeing shadow-like presences hovering near doorways or at the edges of rooms. Some researchers think these figures might be connected to whatever lies on the other side, for lack of a better way to put it.
Can you share the footage? Genuinely curious what the shape of it looks like, whether it has any defined edges or just sort of bleeds into the dark. That detail matters more than people realise.