Sleep TIGHT and sweet dream.
I read a article today. It talked about the origin of "sleep TIGHT".
Following it's the article:
Nowadays, bed frames are made of springs. However, old bed frames used ropes pulled tightly
between the frame rails to support a bed.
When the rope became too loose, the bed would sag, making sleeping very uncomfortable
Tightening the ropes would eliminate the discomfort
and help one to have a good night sleep.
Hope the story is true. How interesting the story it is!!!
Now talk about your thought. haha