How to Say "they sleep" in Spanish
The Spanish word for “they sleep” is “duermen” — A1 level. This is a very common word in everyday Spanish.

Examples
Mis perros duermen en el sofá.
My dogs sleep on the couch.
Ustedes duermen mucho los fines de semana.
You all sleep a lot on weekends.
Ellos duermen profundamente.
They are sleeping deeply.
The 'O' to 'UE' Swap
This word comes from 'dormir.' In many forms, the 'o' changes into 'ue' to make it easier to emphasize the sound when speaking.
Talking about 'Them'
The 'n' at the end of 'duermen' tells you that more than one person is doing the sleeping.
Forgetting the 'N'
Mistake: “Ellos duerme.”
Correction: Say 'Ellos duermen.' Use the 'n' whenever you are talking about a group of people.
Using the 'O' instead of 'UE'
Mistake: “Ellos dormen.”
Correction: Say 'Ellos duermen.' Remember that this verb changes its middle spelling in the present tense.
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