How to explain the feeling of a presence in an empty room?

I'd say it's mostly connected to our nervous system and how the brain processes information around us. When a person is in an empty room, the senses start searching for stimuli more actively than usual. You hear every sound, notice the slightest air movements, shadows from light. The brain tries to find patterns in this noise and sometimes "fills in" things that aren't actually there. I've tested this on myself more than once - when you sit in silence, you start hearing sounds that simply couldn't be there.

Plus there's the expectation effect. If you've already mentally prepared yourself to feel something weird, your brain literally searches for confirmation of it. That's called confirmation bias. The room gets a bit colder because your anxiety goes through the roof, or pressure appears in your chest from muscle tension. It's all physiology, no mysticism whatsoever.

If this feeling haunts you often and causes discomfort, you can just check yourself with logic. Turn on the light, see what's actually in the room. I end up in the gym during quieter times now and then, and when I start focusing on the sensations, they appear. The moment I switch to something specific - working out, music, work - it all goes away instantly.

The point about the nervous system above is spot on! I'd add that it's also about activating what's called the "threat detection system" in your brain. When we're in an unfamiliar situation for us - silence, no visual reference points, limited sensory input - our brain starts to hypercompensate! It's like it switches into high-alert mode and interprets the tiniest sounds, air movement, or even your own heartbeat as something else being there. It's totally normal, especially if you're tired or stressed.

Another important thing is the role of peripheral vision! When there's not much stimuli in the room, our eyes start scanning the space more actively, and sometimes false alarms go off - we notice shadows, reflections, or just patterns that our brain immediately interprets as movement. I've noticed this even on my morning runs when it's still dark! I'm running and suddenly it feels like someone's next to me, but it's just the play of light and being tired.

If these sensations are bothering you - try grounding yourself: focus on specific objects around you, turn on some soft light or background noise. Usually that helps shift your attention and your brain gets out of hypersensitivity mode!