Sleeping helps us to consolidate our procedural memories. This Canadian team managed to get people to go to sleep inside an fMRI scanner. They observed how the brain actually stores away memories.
This online paper also gives a great insight into the peer review process. If you scroll down, you can read the exchange between the editor of the journal and the author, which shows how peer review has improved the work prior to publication.
Network-wide reorganization of procedural memory during NREM sleep revealed by fMRI
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