Odds are, you’ve experienced deja vu at some point in your life.

The sensation can feel unnerving, mysterious, and even a bit mysticalbut what does it really mean?

To find out, we asked an expert and dug into the research.

Sarah Regan

Here’s what to know.

What is deja vu?

Who experiences deja vu?

Kristina Hallett, Ph.D., ABPP

It’s thought to happenless as we get older1and gives the impression of associated with stress and fatigue.

Other research has also linked it withdementia2.

What it’s resulting from.

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There has been extensive research on the topic, though she adds the actualcauseof it remains a mystery.

Why does deja vu happen?

The bottom line.