What Is Deja Vu and Why Do We Experience It?

You Need More Sleep

If you've been skimping on sleep and are having more experiences of déjà vu than is normal for you, your brain is likely telling you to get more shut eye. Stress, exhaustion, and traveling a lot can all trigger more frequent experiences of déjà vu, according to Penn Medicine. It's not known why fatigue or stress might make you experience déjà vu more often, but it's possible that the strain might make the brain more likely to misfire or make mistakes.