Scientific American August/September 2008 https://panet.andover.edu/bbcswebdav/institution/SCIE/SCIE/science%20490/brain%20development/quiet%20sleeping%20brain%20at%20work.pdf “Quiet! Sleeping Brain at Work” – Rich’s slides quotes the “Fast Facts” from the bottom of page 24 (the third page in that PDF).
And here’s the text transcript of the talk: https://github.com/matthiasn/talk-transcripts/blob/master/Hickey_Rich/HammockDrivenDev-mostly-text.md (which is easier for some folks to digest than the video).