hypnopaedia
Teaching (or learning) by subconscious means.
uncountable
'In the end,' said Mustapha Mond, 'the Controllers realized that force was no good. The slower but infinitely surer methods of ectogenesis, Neo-Pavlovian conditioning and hypnopædia…'
Where it comes from
From hypno- (“sleep”) + Ancient Greek παιδεία (paideía, “education”), popularized in the novel Brave New World (1932).
Adapted from the Wiktionary entry hypnopaedia (CC BY-SA 4.0).