How to Say "tiredness" in Spanish
The Spanish word for “tiredness” is “sueño” — A1 level. This is a very common word in everyday Spanish.
English → SpanishA1
NounA1
specifically the kind that leads to sleep

Examples
Tengo mucho sueño, me voy a dormir.
I'm very sleepy, I'm going to sleep.
Después de comer, siempre me entra el sueño.
After eating, I always get sleepy.
El bebé tiene sueño y está llorando.
The baby is sleepy and is crying.
Using 'tener' for Feelings
In Spanish, you don't 'are' sleepy, you 'have' sleepiness. Always use the verb 'tener' (to have) with 'sueño' to say you're sleepy. This also works for hunger ('tener hambre'), thirst ('tener sed'), and age ('tener años').
Using 'ser' or 'estar' instead of 'tener'
Mistake: “Estoy sueño.”
Correction: Tengo sueño. Remember that many physical states that use 'to be' in English use 'tener' in Spanish.
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