Age above 60 years.

Refusal to participate.

Incomplete or duplicate answers.

Not being on duty at the time of the study.

The prevalence of poor sleep in HCWs ranged from 21–66% [13]. At a 90% confidence level with a type I error rate of approximately 5%, the minimal sample size was calculated to be 209 participants (Epi Info 7, Centers for Disease Control and Prevention, Atlanta, GA, USA).

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