INTK Supernatural movie
A woman meets a man (soldier?) at a bar/dance. They end up going back to a room (hotel I believe) and in the morning she wakes up and he is gone but there is seaweed in the bed. She goes to the beach.. It ends up that he died at sea in the war and this was a ghost. This film has been bugging me for ages but I don't remember much of it, possibly set in the past, maybe after WW2. Help please?