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insomnia

in·som·ni·a [ in sómnee ə ]


noun 
Definition:
 
difficulty in sleeping: inability to fall asleep or to remain asleep long enough to feel rested, especially when this is a problem that continues over time

[Early 17th century. < Latin< insomnis "sleepless" < somnus "sleep"]

in·som·ni·ac adjective, noun
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