Neuroscience
Closing the book does not end the learning.
Sleep supports learning and memory. Too little sleep can interfere with performance.
The idea
A feeling of having learned something still needs a check of what you can recall or do.
An example
As a learning exercise, choose a small topic, then later explain it without your notes. Compare the explanation with the material. This can reveal gaps in that task; it cannot diagnose your sleep or prove a particular sleep mechanism.
Try it
Write one question that would test your understanding of what you studied, rather than merely asking whether it feels familiar.
More context
Sleep supports learning and memory. Insufficient sleep can interfere with performance; that does not mean a particular dream proves you have mastered something. Sleep science · no individualized sleep prescription
Sources & further reading
the 102 platform