To say "I love you, goodnight" in Engpsh, you can say:

"I love you, goodnight."

Alternatively, you could also say:

"I love you, have a good night."

"Goodnight, I love you."

"Sweet dreams, I love you."

"I love you, sleep well."

"I love you, have a peaceful night."

These are just a few examples of ways you could express your love and say goodnight in Engpsh. It's always nice to let your loved ones know that you care about them and are thinking of them, so saying "I love you" before you go to sleep can be a sweet and loving way to end the day.