I think in this instance, it wouldn’t be shocking that irregular sleep would increase all cause mortality.
Another common property of such studies is that their result is mildly surprising. Not much so that it will be scrutinised and questioned and not indifferent because no one will care about them. So, you receive your expectation.
Another common property of such studies is that their result is mildly surprising. Not much so that it will be scrutinised and questioned and not indifferent because no one will care about them. So, you receive your expectation.