Anyone else's pets acting strange right before objects start moving?

My two cats have been doing this for years and I've started logging it properly. They'll both freeze and stare at the same corner of the spare room, sometimes for 10-15 minutes, and within about an hour something usually happens - a book off a shelf, a mug sliding on the counter, that sort of thing. What I find interesting is the timing gap. Its not immediate, theres always that window between the animal response and the physical event.

Makes me wonder if they're picking up on some kind of precursor energy, maybe an infrasound signature or EM fluctuation that precedes the main event. Has anyone actually tried running an EMF meter during the animal alert phase rather than waiting for the object movement? That gap might be the most useful window for gathering data and I don't see many people talking about it that way.

Would love to hear from people with dogs specifically - do they react the same way or is it more agitated rather than that eerie stillness cats do?

@SalisburyMoth the logging approach is dead right, thats exactly what you need to establish any kind of baseline. My old lurcher used to do something similar - he'd go completely rigid and track something moving slowly across the ceiling that I genuinely could not see, and twice within maybe 20 minutes of him doing that we had objects shift position in the same room. I never managed to get it properly documented because I wasn't thinking scientifically about it at the time which still annoys me. The key thing I'd want to know from your data is whether the cats are always looking at the same fixed corner or whether the focal point shifts, because that could tell you something about whether you're dealing with a residual location-based phenomenon versus something more active and mobile.