You will likely also find Lex Fridman's conversation with Matt Walker "Why we Sleep" last week interesting.

About 65 minutes in (just after a great discussion on coffee and caffeine) they go into how sleep (and dreaming) facilitates memory and learning - basically the creation of new schemas (models) and the updating and rewiring of existing ones.

What made it interesting was how it meshed with Hawkin's ideas from a completely different angle.

He also touched on why we forget things which is closer to the OP (like not remembering where you parked your car two weeks ago, but remembering where you parked it today), and how some people don't/can't forget things. Also the intricacy of things that we remember (like a particular pair of shoes someone was wearing when we first met them).