noun
insomnia
ihn-SOM-nee-uh
noun
1
A disorder or ongoing difficulty falling or staying asleep.
"His insomnia left him exhausted most mornings."
"Stress and caffeine are common causes of insomnia."
How to Use Insomnia
Learner’s notesIn plain EnglishTrouble sleeping, whether it's a one-off bad night or an ongoing condition.
Common pairings
chronic insomnia
suffer from insomnia
Word Forms
insomnias plural
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Etymology
Borrowed from Latin insomnia, from in- ("without") + somnus ("sleep").