There is indeed a genetic difference, a very few people are able to sleep less with no negative side effects: http://www.timesonline.co.uk/tol/life_and_style/he

There is indeed a genetic difference, a very few people are able to sleep less with no negative side effects: http://www.timesonline.co.uk/tol/life_and_style/health/article6795361.ece http://www.timesonline.co.uk/tol/life_and_style/health/artic...