Sleep duration on workdays or nonworkdays and cardiac-cerebral vascular diseases in Southern China

Compared with a sleep duration of 6-8 h, both short and long sleep duration were associated with the prevalence of MI and stroke and these associations were more pronounced among hypertensive persons, and tended to vary by age and sex. Moreover, sleep debt was linked to greater MI risk among men aged <65 years. These findings suggest that we should develop a healthy biological clock.