Twinkle Twinkle Little Star...

Here were I live is really time to go to sleep ( I live in Wales and now it is 00:20 ).
I was wandering to know how many ways to say "goodnight" you know.
As English language is not my mother tongue I would like to know as much as possible.
The other way to say good night that I know are:

• Nighty Night
• Sleep tight
• Time to ride the rainbow to dreamland

Please tell me even in your mother tongue how to say goodnight, in Italy we say : Buonanotte.

By the way I hope to not count the sheep this night!!!!!!

Goodnight ^_^