I saw the early reading of Sleepless the Musical - dreadful.  Then they had it all rewritten, including the score, but you can't really change the story, can you?  And the story - well - how can it work as a musical?  In the film you have two people in different cities for most of the film - even though they have two brief sightings they really don't meet until the last minute of the movie.  In film you have editing and close-ups.  On stage you have two people at opposite ends of the stage - I don't see how that can ever work.  Not every movie, despite its brand, needs to be a musical.