dormir VERB to sleep
The basic use of dormir is to sleep. Remember that the –o– of the stem changes to –u– in the –endo form:
No hagas mucho ruido, que Rubén está durmiendo. Don’t make a lot of noise, Ruben’s sleeping.
Dormir also has several other meanings that in English we express with different words or phrases than sleep. It can be used with an object to mean to send … to sleep:
La música clásica me duerme. Classical music sends me to sleep.
In the reflexive, dormirse, it means to fall asleep:
Al poco rato se durmió. Shortly afterwards he fell asleep.
And you use the participle, dormido, with estar to mean to be asleep:
Ahora los niños están dormidos. The children are asleep now.