Person: Díaz Morales, Juan Francisco
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First Name
Juan Francisco
Last Name
Díaz Morales
Affiliation
Universidad Complutense de Madrid
Faculty / Institute
Psicología
Department
Psicología Social, Trabajo y Diferencial
Area
Personalidad, Evaluación y Tratamiento Psicológico
Identifiers
4 results
Search Results
Now showing 1 - 4 of 4
Item Morningness-eveningness and sleep habits among adolescents: age and gender differences(Psicothema, 2012) Collado Mateo, María José; Díaz Morales, Juan Francisco; Escribano Barreno, Cristina; Delgado Prieto, Pedro; Randler, ChristophPrevious research has indicated the need to use large samples in different cultural contexts in order to clarify age and gender differences on morningness-eveningness and sleep habits. The goal of our research was to study the relationship between morningness-eveningness and sleep habits in a large sample of 2,649 adolescents between 12 and 16 years. The Morningness- Eveningness Scale for Children and an adaptation of the School Sleep Habits Survey measures were used. Results indicated a greater tendency toward eveningness with age and higher eveningness in 13- and 14-year-old girls. Older adolescents claimed later rising time on weekends, later bedtime and shorter sleep length, and greater social jetlag, weekend rise time delay, and weekend bedtime delay. Girls reported earlier rising time on weekdays, later rising time on weekends, longer sleep length on weekends, and greater social jetlag and weekend rising time delay. Lastly, evening oriented adolescents claimed later rising time and bedtime, shorter sleep length on weekdays but longer sleep duration on weekends, and greater social jetlag, weekend rising time delay, and weekend bedtime delay.Item Sleep habits, circadian preference and substance use in a Mexican population: The use of the Morningness-Eveningness-Stability-Scale improved (MESSi)(Chronobiology International, 2020) Arrona-Palacios, Arturo; Díaz Morales, Juan Francisco; Adan, Ana; Randler, ChristophThis study aimed to validate the Morningness-Eveningness-Stability-Scale improved (MESSi) in Mexico, analyzing the factor structure and sleep habits, combined with the proposal of cut-off values for the scales, and to assess the relationship with substance use. We applied the questionnaires through an online survey to a total sample of 510 Mexicans, aged 18-77 years (M = 27.79, SD = 10.24). The MESSi showed an acceptable fit and the Cronbach’s alpha coefficients were good to satisfactory in the Mexican sample in every subscale: Morning Affect (MA, α = 0.90), Eveningness (EV, α = 0.88), Distinctness (DI, α = 0.80). In order to obtain a better interpretation of the MESSi subscales we decided to propose cut-off points corresponding to the 25th-75th percentile. The categories were depicted as: strong trait presence, intermediate trait presence and weak trait presence. When applying the cut-off points for the MESSi sub-scales, with Morning Affect (MA), strong-types went to bed and woke up earlier and had more sleep than weak-types during weekdays and weekends and reported less social jetlag. For Eveningness (EV), strong-types went to bed and woke up later than weak-types on weekdays and weekends. Also, strong-types had a shorter time in bed during weekdays but not on weekends and reported more social jetlag. Lastly with Distinctness (DI), the results reported that those with a strong-type showed greater amplitude on weekdays and weekends. Furthermore, the MESSi scale found that evening people consumed more alcohol and tobacco. Our study supported the validity and reliability of the MESSi in a Mexican population and the relationship between eveningness and substance consumption. Furthermore, the proposed cut-off scores for the MESSi sub-scales add a novel approach for the measurement and interpretation of the scale.Item Chronotype, gender, and time for sex(Chronobiology international, 2014) Jankowski, Konrad S; Díaz Morales, Juan Francisco; Randler, ChristophThe study aimed at testing chronotype and gender differences in the time of day when humans feel the greatest need for sex and the time of day they actually undertake sexual activity. A Polish sample of 565 participants aged between 18 and 57 was tested. In females, regardless of chronotype, the greatest need for sex occurred between 18:00 and 24:00, but a secondary peak appeared in morning types at 6:00-9:00. In males, the greatest need for sex occurred either in the morning or evening: in evening types at 9:00-12:00 and 18:00-3:00; in neither types at 6:00-9:00 and 18:00-24:00; in morning types at 6:00-12:00 and 18:00-24:00. Considering time of day when subjects were undertaking sexual activity most frequently, this appeared between 18:00-24:00 for all the participants, and prolonged until 3:00 at night in evening type males. Morningness preference was more strongly related to the timing of need for sex than to the timing of actual sexual activity (r = -.275 vs. r = -.174), while the timing of desire and the timing of sexual activity were positively, but moderately related (r = .320).Item Morningness-eveningness and sociosexuality: Evening females are less restricted than morning ones(Personality and Individual Differences, 2014) Jankowski, Konrad S; Díaz Morales, Juan Francisco; Vollmer, Christian; Randler, ChristophSociosexual orientation is a construct describing the propensity to engage in casual sex and sexual activity in uncommitted relationships, varying from restricted to unrestricted orientation. The personality profile of people exhibiting unrestricted sociosexuality matches a personality profile related to eveningness. Previous research on sociosexuality and morningness–eveningness is scarce, however, and conducted only with male participants. The present study aimed at testing whether eveningness is related to unrestricted sociosexuality in both genders. Participants were 352 (62.8% female) Poles aged between 17 and 57. They completed the reduced morningness–eveningness Questionnaire and the revised Sociosexual Orientation Inventory, consisting of three facets: behavior, attitude, and desire. The results revealed that females were more restricted than males in all facets of sociosexuality. Moreover, in both genders older age was related to less restricted behavior and attitude. Analyses showed that morningness– eveningness was unrelated to sociosexuality in males, but in females eveningness was linked to less restricted global sociosexuality .Eveningness in females could be regarded as a contributory factor to the instability of romantic relationships and high-risk sexual behaviors.