Comment by codedokode

Could it be that irregular sleeping is caused by inner clock being off due to genetic errors, and genetic errors are the main cause of mortality? I.e. irregular sleep is not the cause but the indicator?

Or irregular sleep corresponds to bad habits like drinking and using drugs and they are the cause of mortality?

Or, could it be that problems with sleep are caused by using alarm clocks, i.e. not waking up naturally but forcefully at unnatural time? Waking up at the same time every day benefits people whose inner clock has 24h period and disadvantage people with clock tuned to 23h or 25h day.

Or I am wrong?