Title: The scientific reasons you can 'sense' when someone is watching you
Headings: 
Because your eyes pick up on more than you know.
Because you can think your way into feeling.
Because gaze is extremely important.
Because you often wrongly assume that you're being looked at …
… but that can actually be a good thing.

Content: Because you often wrongly assume that you're being looked at …
That's not to say we always get it right. A 2013 study published in the journal Current Biology found that when we're uncertain about which way a person's gaze is directed — like when their eyes are hidden behind sunglasses — we often falsely assume that we're the target. Which, in turn, means that the feeling of being watched may become a self-fulfilling prophecy: When you think someone is staring at you from behind, you might turn around suddenly to face them, causing that person to look in your direction. It's also possible that you subconsciously noticed that person staring at you before you turned your back, and your memory alerted you to the fact several minutes later. … but that can actually be a good thing. Let's face it, we humans are self-centered beasts — beasts that once upon a time had to survive a far greater risk of violent threats than we do now. We're sensitive to gaze, researchers believe, because that sensitivity can be a tool for survival. " Direct gaze can signal dominance or a threat, and if you perceive something as a threat, you would not want to miss it," Colin Clifford, a cognitive scientist at the University of New South Wales and one of the co-authors of the Current Biology study, explained in a statement. " So assuming that the other person is looking at you may simply be a safer strategy."