Fifty-nine adults slept five nights with an Actigraph and answered two questionnaires related to sleeping quality and morningness/eveningness preferences. Next they performed a computerized attention task (the mathematics continuous performance test (MATH-CPT)) to assess various measures of attention. Results showed significant correlations between six attention variables and two measures of sl...

Research examining various psychological correlates of circadian type (also known as diurnal preference) has been, over the years, quite expansive. A notable omission within this research program would appear a systematic exploration of the relation between intelligence and morningness± eveningness. The present study redressed this imbalance. 420 participants performed two self-report inventori...

background: improvement of sleep quality is one of the major issues of human life that can help people maintain their energy resources and has beneficial effects on many behaviors. the aim of this study was to determine the sleep quality and its associated factors among students of razi school of nursing and midwifery, kerman, iran.   methods: a total of 349 students were included in this cross...

The mammalian circadian system is composed of a light-entrainable central clock in the suprachiasmatic nuclei (SCN) of the brain and peripheral clocks in virtually any other tissue. It allows the organism to optimally adjust metabolic, physiological and behavioral functions to the physiological needs it will have at specific time of the day. According to the resonance theory, such rhythms are o...

Pediatric bipolar disorder (BD) rates have notably increased over the past three decades. Given the significant morbidity and mortality associated with BD, efforts are needed to identify factors useful in earlier detection to help address this serious public health concern. Sleep is particularly important to consider given the sequelae of disrupted sleep on normative functioning and that sleep ...

Objective: This research was conducted to identify the relationship between chronotypes of nurses working in shifts and quality their lives.
 Methods: The sample that designed as a descriptive study comprised 267 shifts. data were collected with survey form, Morningness–Eveningness Questionnaire, Short-Form Health Survey (SF-36).
 Results: As per breakdown by chronotype, 68.9% interme...