Sleep quality and insomnia in nurses with different circadian chronotypes: Morningness and eveningness orientation

Abstract

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 [23] questionnaire to assess the distribution of morningness or eveningness preference, the Pittsburg Sleep Quality Index [22] and Insomnia Severity Index questionnaire [21] 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.

Prevalence and Effects of Sleep Disorders Among Shift Work Nurses

“…they found that there is a linear and direct relationship between sleepless severity of the nurses and the number of nursing shift work, so the severity of insomnia was increased in the nurses (R 2 = 0.76) with the increase in the number of shift works per week. Similarly, Yazdi et al showed that the number of nurses' night shift works had a significant effect on insomnia severity of the nurses (P < 0.05) (36). Among the common problems of the nurses, we can mention problems that are associated with sleeping, including problem in staying sleeping, irregular sleep pattern, and problem in enjoying a deep sleep.…”

“…The results of the ISI questionnaire showed that more than 55% of the studied nurses suffered from moderate to very high levels of insomnia that could be a danger alarm to the nursing society in order to prevent from the effects of insomnia on the health of the nurses and improve the quality of prepared health serviced to patients. In this regard, it was reported in a study that was conducted by Yazdi et al on the nurses of Qazvin hospitals the prevalence of insomnia was high among 160 nurses (36). they found that there is a linear and direct relationship between sleepless severity of the nurses and the number of nursing shift work, so the severity of insomnia was increased in the nurses (R 2 = 0.76) with the increase in the number of shift works per week.…”

Rotating-shift nurses after a day off: peripheral clock gene expression, urinary melatonin, and serum 17-β-estradiol levels

“…Participants completed a questionnaire regarding their work schedule, sleep quality according to the Pittsburgh Sleep Quality Index (PSQI) (54), reproductive physiology, physical activity, and other habits such as smoking and alcohol consumption. Chronotype was assessed by the "Morningness-Eveningness Questionnaire" (MEQ) (55), a 19-item questionnaire with a total score ranging from 16-86 extensively used among adults and workers (56)(57)(58)(59). Samples of fasting blood (8 hours) were collected at 07:00 hours and were processed immediately after collection to prevent a possible extracorporeal clock gene induction.…”

Association of PER2 and CRY1 Polymorphisms with the Morningness-Eveningness in Korean Adults

“…Recently, the associations between the polymorphisms of CLOCK and sleep quality were investigated, however, researchers failed to find a significant association. 25 It has been shown that MT subjects had better sleep quality compared with ET subjects, 26 but most studies did not report a difference in sleep quality in comparison with NT subjects. Some studies, including ours, suggest that NT subjects have better sleep quality than MT subjects.…”