There's actually no such language as "Creole". The word creole refers to a type of language that results from the combination of two completely different parent languages. There are more than 100 different creolized languages in the world, so you would have to specify which one you're talking about.
If you're not sure, here is a list of the most commonly spoken Creoles in the world (one of them is even an official language):
Good night, sweet dreams. They speak English in Hawaii.
mimpi indah
Yoi yume o
Sweet dreams = Vise plăcute (vee-seh plu(gh)-quh-teh)
Dulces sueños muñeca
In Cape Verdean Creole, you can say "sonhos docis" to mean "sweet dreams." The phrase reflects the language's blend of African and Portuguese influences. Different islands may have variations, but this phrase is widely understood.
Sweet in creole
sweet dreams
To say, "have sweet dreams" in Welsh is "cewch breuddwydion hyfryd"
To say "sweet dreams" in Portuguese, you can say "sonhos doces."
Sweet dreams translates to drøm sodtin Danish.
sweet dreams are 'de beaux rêves' in French.
You can say "Lijepi snovi" in Bosnian, which translates to "sweet dreams" in English.
"মিষ্টি স্বপ্ন" (Mishti Shapno) is how you say "sweet dreams" in Bengali.
You can say "matamis na mga pangarap" in Tagalog, which translates to "sweet dreams" in English.
Sweet dreams translates to punjara swapnangal in Malayalam.
You could say either, but the traditional good-night phrase is "Sweet dreams."