A medical condition characterized by the inability to sleep or a complete lack of sleep.
From Greek 'a-' (without) + 'hypnos' (sleep); a-, the negation prefix, combines with the ancient Greek god of sleep Hypnos to describe sleeplessness.
Fatal Familial Insomnia is an extremely rare genetic disease that causes ahypnia and is one of the few conditions truly incompatible with life—patients literally cannot sleep and their bodies eventually fail.
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