Sleep physiology responds to the specific mapping of memory in the brain, focusing on the cortical regions that were most active and require the most attention for plasticity.

“it's almost as though your sleep physiology responds to the mapping of the memory in the brain wherever the memory is that's where sleep when you go to sleep sort of starts massaging the cortex so that you get that plasticity it's almost like a good masseuse you know you sort of sit down they say where are your problem points and you say it's it's here and here and so they don't give you a general massage they go to work on the regions that have been working hardest that require greatest attention sleep does that”