Skip to main content
Login | Suomeksi | På svenska | In English

Browsing by Subject "unen määrä"

Sort by: Order: Results:

  • Associations between personality traits and sleep quality and quantity in young adults 
    Martikainen, Silja (2010)
    This thesis examines the associations between personality traits and sleep quantity and quality in young adults. Additionally the possible effects of birth status on these associations are examined. The data used in this thesis is part of a birth cohort study (Helsinki Study of Very Low Birth Weight Adults). The personality traits are based on the five-factor model of personality. The sleep quantity and quality are based on actigraphy assessments. Four hypothesis were made about the personality and sleep associations: (1) neuroticism is related to a lesser quality of sleep, (2) there will be more significant associations between personality traits and sleep quality than between personality traits and sleep quantity, (3) the Very Low Birth Weight (VLBW) as well as, (4) the Small for Gestational Age (SGA) status will affect the associations. Linear regressions were used to study the associations between personality traits and sleep quality and quantity. Whenever an association was significant, it was tested whether this association was moderated first, by the VLBW and second, by the SGA status of the participant. The results were mostly in line with previous research especially demonstrating the negative association between neuroticism and the quality of sleep and suggesting that vulnerability to stress decreases sleep quality. Also it was found that agreeableness and conscientiousness were associated with better sleep quality and extraversion was associated with lower sleep quantity. In addition SGA status moderated the personality and sleep associations. It is proposed that there are two factors behind the interaction. First, prenatally developing mechanisms have an effect on the development of sleep as well as personality. Second, differences in the postnatal environment, for instance the parenting practices, can account for this finding. Future research could focus especially on what kind of prenatal disturbances SGA infants have in the development of mechanisms related to sleep and personality. Also focusing on the differences in parental interaction might shed more light on the results.
  • Masennuksen yhteys aktiivisuusmittarilla mitattuun unen määrään ja itsearvioituun unen laatuun 
    Heikkinen, Silja (2017)
    Aims. Sleep duration and sleep quality greatly affect our physical and mental health. Negative impact of depression on sleep duration and quality is well established. Studies on the relation between objectively measured sleep duration and self-reported sleep quality are fewer in number, at least with larger sample sizes. It is still unclear whether or not depression moderates the association between sleep duration and sleep quality. The aim of this study was to examine how actigraphically measured sleep duration is related to sleep quality and whether depression moderates the association between them. Also of great interest was how age and gender affect these sleep parameters. Methods. This study was based on data from Biomarker-Project (n=1255) which is a part of MIDUS-II-study (Midlife in the Unites States). Some participants (n=489) from Biomarker-study were also recruited to take part in a sleep study where sleep duration was measured at participant's home environment for seven consecutive days using an actigraphy device. Participants also completed daily sleep diaries of their sleep quality (range 1-5) for that time period. Participants in the sleep study were on average 55 years old (range 32-83 years) and 39 % of them male. Depression was assessed using CES-D-scale (Center for Epidemiological Studies–Depression). Data was analysed using mixed-linear model where repeated measures, days (7) are nested within subjects. Results and Conclusions. The main results of this study were that those suffering from depression had significantly shorter sleep duration and decreased quality of sleep. Longer sleep duration was associated with better sleep quality regardless of depression. Based on previous research, poor sleep quality is associated with increased levels of stress and daytime fatigue and decreased health status and quality of life. Short sleep duration is linked to depression but it is also associated with chronic health problems such as diabetes and cardiovascular disease. These results indicate that interventions directed at lengthening sleep duration are important in improving health and also enhance sleep quality regardless of depression. Sleep problems precede and predict the onset of depression, so early and adequate treatment of sleep problems could be seen as a major preventive strategy in mental health care.

Yhteystiedot

HELSINGIN YLIOPISTO