Sure, here are 13 ways to say "goodnight" in English:
1、Sweet dreams!
2、Sleep tight!
3、Nighty night!
4、Have a peaceful night!
5、Rest well!
6、Dream of lovely things!
7、May you have restful sleep!
8、Goodnight, sleep well!
9、Wishing you a cozy night!
10、Until tomorrow!
11、Catch you in the morning!
12、Time to hit the hay!
13、Lights out, sleep soundly!