Baseline characteristics of the 82,

Baseline characteristics of the 82,969 women are shown in Table 1
stratified by sleep-duration response. Women reporting both long and
short sleep durations tended to be older and heavier and to have more illnesses.
Alcohol use was greater and exercise lower with increasing sleep
duration. A history of working night shifts was most common in nurses
reporting sleeping 5 hours or less, with nearly a
third of this group reporting 5 or more years of
shift working.