insomnia

US /ɪnˈsɑ:mniə/

UK /ɪnˈsɒmniə/

C1
n. (u.)Uncountable NounInability to sleep for many nights
I have been suffering from insomnia for three weeks now, and as a result I have become very tired
n. (u.)Uncountable NounA specific instance or occurrence of sleeplessness.
He suffered an episode of insomnia after a particularly stressful day at work.

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