Why don't new memories overwrite old ones? Sleep science holds clues
Briefly

Imagine the brain is like a library where books (memories) are stored. Each time a new book is added, it could accidentally displace an old one. Our study suggests that during sleep, the brain creates dedicated time slots for reviewing new and old memories separately, which may prevent this chaotic mixing of information, preserving the integrity of established memories.
During our research, we noticed a fascinating relationship between pupil size and memory consolidation. The fluctuation in pupil size during deep sleep prompted us to explore if this change indicated a switch between processing new and old memories, almost like the brain was turning pages in two different books at once, avoiding interference.
Read at Nature
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