[hip-nol-uh-jee] /hɪpˈnɒl ə dʒi/
the science dealing with the phenomena of sleep.
(psychol) the study of sleep and hypnosis
noun a passion for sleeping Word Origin hypno- ‘sleep’
[hip-nohn] /ˈhɪp noʊn/ noun, Chemistry. 1. .
/ˌhɪpnəʊˈpiːdɪə/ noun 1. the learning of lessons heard during sleep
[hip-nuh-pee-dee-uh] /ˌhɪp nəˈpi di ə/ noun 1. . n. also hypnopaedia, “sleep-learning,” 1932, from Greek hypnos “sleep” (see somnolence) + paideia “education” (see pedo-).