Sleep quality and insomnia in nurses with different circadian chronotypes: morningness and eveningness orientation.
BACKGROUND
Morningness and eveningness preference (chronotype), an endogenous component of the circadian clock could play a key role in a worker's ability for adjusting to shift work. Morning types are those individuals who prefer going to bed and waking up early, whereas Evening types tend to sleep at later hours and find it difficult to get up in the morning.


OBJECTIVE
The objective of this study was to survey, the relationship between morningness-eveningness type, sleep quality and insomnia in shift worker nurses.


PARTICIPANTS
The participants comprised 160 nurses working in three different wards in two university hospitals in Iran.


METHODS
Nurses completed the Horne and Ostberg questionnaire to assess the distribution of morningness or eveningness preference, the Pittsburg Sleep Quality Index and Insomnia Severity Index questionnaire to measure self reported sleep quality and insomnia. Demographic information was also collected in order to explore the relationship between circadian rhythms, sleep quality and prevalence of insomnia in shift workers.


RESULTS
The results showed that the prevalence of poor sleep quality was high. More than half of the participants had poor sleep. Evening type nurses had worse sleep quality in our study (P < 0.05). There is not any significant association between the shift type and age of the nurses with their quality of sleep (P > 0.05).


CONCLUSIONS
The results suggested that nurses who had a morning sleep preference had better sleep quality. A survey of chronotype of nurses could be useful, so that individuals may be assigned to different shifts according to their sleep preference.
['Yazdi|Zohreh|Z|', 'Sadeghniiat-Haghighi|Khosro|K|', 'Javadi|Ali Reza Haj Seid|AR|', 'Rikhtegar|Ghasem|G|']
D000328:Adult D057906:Circadian Clocks D005260:Female D006801:Humans D007492:Iran D009741:Nursing Staff, Hospital D015995:Prevalence D012890:Sleep D007319:Sleep Initiation and Maintenance Disorders D014940:Work Schedule Tolerance D055815:Young Adult
Chronotype morningness-eveningness circadian rhythms nurse management sleep disturbance