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Could anyone tell whether this sentence is idiomatically and grammatically correct

It's very important for me to see a happy ending in movies otherwise I wouldn't be able to sleep well.

Thanks

Comments  

You need a comma:

It's very important for me to see a happy ending in movies, otherwise I wouldn't be able to sleep well.

The tenses are a bit scrambled; "wouldn't be able to" would be better as "can't". And "to see a happy ending in movies" would be more natural as maybe "that movies have happy endings", but a native speaker might well say it the way you have it..