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Table 1 Causes of fatigue and difficulty initiating sleep, and methods used to initiate sleep among the 602 responding to multiple choice questions.

From: The use of sleep aids among Emergency Medicine residents: a web based survey

Causes of fatigue or difficulty initiating sleep Fatigue during waking hours Difficulty initiating sleep
Work hours and/or demands of work 84 41
Emotional stress from work related activities 53 49
Family commitments 49 27
Changing circadian rhythms 85 66
Other 4 1
   Maintaining sociality 1.3 -
   Relationship problems 0.5 -
   Eating habits 0.7 -
   Financial stress 0.3 0.2
   Medications 0.4 -
   Hormonal cycles 0.2 -
   Stress over household maintenance - 0.3
   Lack of exercise - 0.2
   Pregnancy - 0.2
   Health problems - 0.2
  1. All numbers are percentages; respondents could provide more than one answer for each question.