Smoke detectors in every room is a bit over the top.
The issue is really *sounders* in every bedroom, not detectors. Once you have a good solid firedoor the sound of the alarm will be significantly attenuated. Many people can sleep through very loud noises - e.g. people who are old and deaf, young children, and drunk people.
http://strategicfire.org/wp-content/uploads/2015/04/bruck-article.pdf