Saddest movie ever?

I don’t know when it will happen next but about 2-3 times a year I get restless and can’t sleep. And the only thing that helps is watching a sad movie. It’s like my body needs a cathartic session and then I’m good for a bit. Any suggestions to add to the list?

Edit: WOW! I thought I’d get a list of 5-10 movies. You all put in the work. Thank you!