Old black and white movie......?

Question

Years ago I saw an old black and white movie but all I can recall is I think the couple were on a boat, maybe a cruise then at the end they hear a bell ringing but it turns out to be the sound of glass breaking as they are unconscious at home after a gas leak and the whole thing was just a dream. This has been driving me mad for years!!!

Answer 1

was it UK or US movie, ?

i am quite good with films but this one does not come to mind.

I will have at look at my film info