Late to the party but going to post anyways...
So, recent R&D into sleep tech has come along ways in the past 20 years. Basically research has shown that during nap/sleep cycles our brain moves around memories (from short-term to long-term and prioitization) and connections between memories. Also, this process optimizes information in the brain to make the access faster and more efficient thus providing opportunity for neuralogical advanced thought sessions given the datasets after a nap/sleep session.
Some basic take aways include +20% memory capacity per 8-hour sleep cycle and longer un-interrupted access to memory collections. It's also been shown that it's possible to tag the day's memories and then prioritize them during the next nap/sleep session. Significant results have shown that groups that take 30-minutes nap have stronger memory capacity versus groups with no naps.
The face of the R&D seems to be Matt Walker - PhD Brit with intense accent - you've been warned!
TL:DR - The brains basically recharges AND rewires during nap/sleep sessions.
Here's the links:
podcast: The Matt Walker Podcast
book: https://www.amazon.com/Why-We-Sleep-Unlocking-Dreams/dp/1501...