What Is Deja Vu and Why Do We Experience It?

You're Not Paying Attention

Apparently, the more distracted you are, the more likely you are to experience déjà vu. This is called the split-perception theory; if you're looking at your phone or distracted by something else, and only glance around quickly, your perception might be split into two parts rather than one, and makes your hippocampus slightly confused. Look at things more closely, though, and the feeling will likely dissipate.