Usage Note
Insomnie is usually used in the singular (souffrir d'insomnie, avoir de l'insomnie), though the plural insomnies is possible for recurring bouts. Un insomniaque / une insomniaque describes the person affected. In French medicine, a distinction is made between insomnie passagère (temporary) and insomnie chronique (chronic).
Examples
"Elle souffre d'insomnie depuis des semaines."
Natural Translation
She has been suffering from insomnia for weeks.

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