From a recent study:
Dr Nicolas Dumay, the study’s author, said:
“Sleep almost doubles our chances of remembering previously unrecalled material.
The post-sleep boost in memory accessibility may indicate that some memories are sharpened overnight.
This supports the notion that, while asleep, we actively rehearse information flagged as important.
More research is needed into the functional significance of this rehearsal and whether, for instance, it allows memories to be accessible in a wider range of contexts, hence making them more useful.”
The boost to memory could be down to activity in the hippocampus, Dr Dumay thinks.
It’s in this region of the brain that recently laid down memories may be ‘unzipped’ and ‘replayed’.
It could be this process that helps us remember things we couldn’t before.
The research was published in the journal Cortex (Dumay, 2015).