go to sleep!
How would you command a child to sleep?
¡Duerme! ¡ve a dormir!
4 Answers
Go to sleep
Duérmete
Vete a dormir
A dormir
Vete a la cama
Vuélvete a dormir / Go back to sleep
I've never heard duerme used in this context. I'm not saying it isn't right, just that I never heard it.
I give you a lullaby, duérmete:
Niña niña, ¿quien descansa?
Descansa niña, por la noche.
Cerrados los pétalos de flores
Tranquilas son las mariposas.
Duerme la tierra y el cielo
Duerme la luna, duérmete.
¡Vaja a dormir! is another way,
The imperative 'Duerme' is good too. I am not sure about how common 've a dormir' is
I would say "Vete a dormir"