Here are a few ideas for creative ways to say goodnight in Engpsh:

"Sweet dreams and have a peaceful night."
"I hope you have a wonderful sleep and wake up feepng refreshed."
"Goodnight! May your dreams be as cozy as your bed."
"Sleep tight, don't let the bedbugs bite."
"I'll be dreaming of you tonight. Goodnight."
"Goodnight, friend. Rest well and wake up ready to conquer the world."
"Farewell for now, my love. Sleep well and dream of all the adventures we'll have tomorrow."
"Goodnight and happy dreams. See you in the morning."
"Wishing you a night of peaceful rest and sweet dreams."
"Goodnight, may your slumber be deep and restful."

I hope these suggestions help!