hypnagogic

 
Pronunciation: /ˌhɪpnəˈgɒdʒɪk/
(also hypnogogic)

adjective

Psychology
  • relating to the state immediately before falling asleep.

Origin:

late 19th century: from French hypnagogique, from Greek hupnos 'sleep' + agōgos 'leading' (from agein 'to lead')