system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is that feeling / sense of a person entering your space? Often not hearing a foot print or any sound but feeling...a static-y sensation of a body?

So often I can sense my coworkers standing there without ever hearing them. I find it's akin to the 'I think we're being watched' sensation you get in nature.
gpt
Your conscious doesn't receive/process all the information given to it by the rest of the body, but the subconscious will process it. This can lead to situations where your conscious is focusing on one thing, but your subconscious is focusing on another. In your case, it would be subtle cues light dimmer light because they are in a doorway, a shadow, a bit of air movement because they changed room airflow. Your conscious is then alerted, but not by the sensation, but by your own brain telling you that it 'felt' something.