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Last year, the researchers published the connectome for what they called the “hemibrain,” a large portion of the central fly brain, which includes regions and structures that are crucial for sleep, learning and navigation.

And so my boys have grown up with Ginsburg’s voice in their heads, just like I had as I rocked them to sleep, learning that motherhood is strength as much as it is tenderness.

In our cover story, “Sleep Learning Gets Real,” by Ken.

Visit Harvard Medical School's Healthy Sleep website for more about sleep, learning and memory.

Huxley was using the idea to explore social conditioning and control in a dystopian future, rather than what we might call “useful” learning, but the promise of effortless learning while we sleep is an idea that refuses to go away, as evidenced by the continued existence of dubious sleep learning “courses”.