BACKGROUND Delayed sleep phase disorder (DSPD) is a condition in which patients have difficulty falling asleep before the early morning hours and commonly have trouble awakening before late morning or even early afternoon. Several studies have suggested that variations in habitual bedtime are 40-50% heritable. METHODS We recruited a case series of 205 participants, along with 221 controls (DS...

Genetic analyses of circadian rhythm sleep disorders (CRSD), such as familial advanced sleep phase syndrome (ASPS) and delayed sleep phase syndrome (DSPS), and morningness-eveningness revealed the relationship between variations in clock genes and diurnal change in human behaviors. Variations such as T3111C in the Clock gene are reportedly associated with morningness-eveningness. Two of the ped...

Abstract Study objectives To investigate circadian typology in a large, representative sample of Norwegian adolescents, and its implications for sleep health. Methods The included 3920 1st year high school students aged 16–17 years. Respondents completed web-based survey, including the short version Horne-Ostberg Morningness-Eveningness Questionnaire (rMEQ), Munich Chronotype (MCTQ) items on sl...

BACKGROUND Shift work-related carcinogenesis is hypothesized to be mediated by melatonin; however, few studies have considered the potential effect modification of this underlying pathway by chronotype or specific aspects of shift work such as the number of consecutive nights in a rotation. In this study, we examined melatonin patterns in relation to shift status, stratified by chronotype and n...

The Composite Scale of Morningness (CSM) is a psychometrically sound instrument available in several languages, including French, aimed at arranging individuals along a continuum from high "eveningness" to high "morningness." On the other hand, impulsivity is involved in many personality disorders and is thought to be orthogonal to venturesomeness, which can be seen as a component of the broade...

OBJECTIVES To investigate the independent effects of depression and subtypes of anxiety on insomnia, and vice versa, and the independent effect of chronotype on insomnia, depression, and subtypes of anxiety. METHODS In all, 318 South Australian high school students from grades 7-11 (age range, 12-18years; mean, 14.97±1.34) participated in this cross-sectional study. Validated self-report ques...

This cross-sectional study examined the association between the morningness/eveningness dimension and eating patterns. The sample consists of 100 subjects who were screened at a nutrition clinic and was composed of 77% women; mean age was 39.5 (±11.7) years; and 66% were overweight. Significant bivariate correlations were found between the Morningness-Eveningness Questionnaire (MEQ) total score...

Abstract Introduction An eveningness chronotype is generally associated with reduced sleep continuity and quality, as well social jetlag. Changes in hormones menstrual phase similarly impact sleep, although research on the chronobiological effects of these changes are equivocal. This study aimed to examine role cycle daily self-report actigraphy-assessed two consecutive cycles. Methods Particip...