Most common dreams across borders

Falling Water?

 The story of three unrelated people, who slowly realize that they are dreaming separate parts of a single common dream. Each of them is on a mysterious and highly personal quest - one is searching for his missing girlfriend, one is searching for a lost child, one is looking to cure his catatonic mother - and it is the clues found in their collective dream that come to guide them.

https://www.imdb.com/title/tt4520992/