How to Say "sleeplessness" in Spanish
The Spanish word for “sleeplessness” is “insomnio” — B1 level.
English → SpanishB1
nounB1
general lack of sleep

Examples
No puedo dormir bien por el insomnio.
I can't sleep well because of insomnia.
El estrés es una causa común del insomnio.
Stress is a common cause of insomnia.
Existen muchos remedios naturales para combatir el insomnio crónico.
There are many natural remedies to fight chronic insomnia.
Gender of the word
This word is masculine, so you always use 'el' or 'un' with it (el insomnio).
Verbs to use with it
To say you 'have' insomnia, you use the verb 'tener' (Tengo insomnio) or 'padecer/sufrir' (Sufro de insomnio).
Confusing the noun and adjective
Mistake: “Estoy insomnio.”
Correction: Say 'Tengo insomnio' (I have insomnia) or 'Estoy insomne' (I am sleepless).
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