Definition of insomnia noun from the Oxford Advanced Learner's Dictionary

 

insomnia

 noun
noun
BrE BrE//ɪnˈsɒmniə//
 
; NAmE NAmE//ɪnˈsɑːmniə//
 
[uncountable]
 
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the condition of being unable to sleep to suffer from insomnia see also sleeplessness Wordfinderdoze, dream, drowsy, insomnia, oversleep, REM, sedative, sleep, soporific, tired Word Origin early 17th cent.: from Latin, from insomnis ‘sleepless’, from in- (expressing negation) + somnus ‘sleep’.
See the Oxford Advanced American Dictionary entry: insomnia