vs 

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"Good night" is a form of "good night", a phrase which is often translated as "buenas noches". "Sleep tight" is a phrase which is often translated as "que duermas bien". Learn more about the difference between "sleep tight" and "good night" below.
sleep tight(
slip
 
tayt
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. que duermas bien
Good night! Sleep tight!¡Buenas noches! ¡Que duermas bien!
b. que descanses
I love you. Sleep tight.Te quiero. Que descanses.
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good night(
good
 
nayt
)
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. buenas noches
Go to sleep! Good night!¡Duérmete! ¡Buenas noches!
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