We believe it has something to do with electrical discharges in the brain that cause faults in the way you store memories. It’s not that you’ve really seen what you’re seeing before. It’s that your brain already wrote the memory, but your consciousness doesn’t realize it yet. You feel like it was a long time ago, but it wasn’t. Time is highly subjective. Its interpretation relies on the brain’s ability to interpret and imprint memories correctly. There’s a tremendous amount that can go wrong.”