This is a six paged research article written in APA format (times new roman, 12 point font, double spaced). Each paragraph should have 2 pages. I have attached all files n

Paper Assignment: Psych 2400 The paper for this class should be 6 double-spaced pages in length and is worth 220 points. The paper is due on Sunday, July 31st (7/31) by 11:59pm on Canvas. Please contact me with drafts and ideas if you would like, and I will provide feedback. For feedback on early drafts, they must be sent to me at least four days in advance of the deadline. Each paper should be typed and double spaced (Times New Roman font, 12 pt., 1 inch margins). In-text citations and the reference page must be in APA format (refer to the Purdue OWL linked below with questions about this. In addition, no quotations are allowed in this paper (from the interview, research article, or book). Papers will be graded according to how well they are written, relate to the assignment, and the ways in which ideas and concepts are linked. Late papers will be reduced by 10% per day late and must be sent to my email. To make sure you get full points on your paper, make sure that it is in APA style. This includes: – In-text citations (Author(s) last name, year of publication). Both papers should cite research articles or the lectures/textbook. Example below about how to cite a lecture. – 1-inch margins, double spaced, 12 pt. font, Times New Roman – Reference page with each reference in alphabetical order with a hanging indent – You do not need an abstract There is an APA template available for you to download and use as you write your paper, and it’s located in the Final Paper Module and Page on Canvas. Consult the Purdue OWL: (https://owl.purdue.edu/owl/research_and_citation/apa_style/apa_formatting_and_style_g uide/general_format.html) with any questions about APA style. There is an APA template on Canvas that will help you with APA formatting—it is strongly recommended you use it to guide you as well. RESEARCH PAPER: This paper must focus on research on a topic pertaining to lifespan developmental psychology. Overall, the paper involves a) you reading scientific journals for research on a topic of interest in lifespan developmental psychology; b) thoroughly reading and familiarizing yourself with the paper you choose; c) writing a 6 page paper about the study explaining it and critiquing it for an audience outside of a college setting. Try to write it for someone who has never taken a psychology course. The paper should have three sections of approximate equal length (about 2 pages each). These sections are:

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Feeling Good When Sleeping In? Day-To-Day Associations Between Sleep Duration and Affective Well-Being Differ From Youth to Old Age

Cornelia Wrzus Max Planck Institute for Human Development, Berlin, Germany

Gert G. Wagner German Institute for Economic Research, Berlin, Germany, Max Planck Institute for Human Development, Berlin, Germany, and

Technische Universität Berlin

Michaela Riediger Max Planck Institute for Human Development, Berlin, Germany

The current study investigated how night-to-night variations in sleep duration relate to affective well-being the next morning as well as how the relationship varies for people of different ages. Using an Experience Sampling approach, 397 participants aged 12 to 88 years reported their sleep duration and their momentary affect on 9 mornings, on average. Associations between sleep duration during the previous night and morning affect differed depending on the participants’ age. For adolescents, for example, affective well-being in the morning was worse the shorter participants had slept the previous night. For adults aged over 20 years, however, affective well-being was worse following nights with shorter or longer than average sleep duration. This effect was more pronounced the older the participants were. The findings demonstrate that the importance of sleep duration for daily affective well-being is better understood when considering the age of the sleeper. In adults, but not adolescents, not only sleeping less but also sleeping more than one’s average can be associated with lower affective well-being.

Keywords: sleep, affective well-being, within-person, Experience Sampling, life span

Supplemental materials: http://dx.doi.org/10.1037/a0035349.supp

It is undisputed that sleep fulfills important functions, such as allowing physical repair processes or facilitating memory pro- cesses (Diekelmann & Born, 2010; Mignot, 2008). Less is known about the role of sleep for people’s affective well-being. So far, effects of sleep on affective functioning have mainly been exam- ined in sleep deprivation or clinical studies. These studies reliably show that sleep deprivation decreases affective well-being (Haack & Mullington, 2005; Talbot, McGlinchey, Kaplan, Dahl, & Har- vey, 2010). Clinical studies add that sleep disturbances, for exam- ple, insufficient (insomnia) or excessive (hypersomnia) sleep, are especially common among affective disorders, such as depression (Peterson & Benca, 2008). Both lines of research focus on ex-

tremes—severe sleep deprivation or pathological affect—rather than on normal ranges of sleep and affect. Our aim was to inves- tigate how naturally occurring day-to-day variations in the per- son’s sleep duration relate to daily affect.

Walker and van der Helm (2009) proposed that sleep facilitates affective well-being, among others, by restoring the connectivity between the limbic system of the brain—an area associated with emotion generation—and parts of the prefrontal cortex—an area associated with emotion regulation. Presumably, this ensures that a night’s sleep enables the then rested brain to handle affective experiences effectively and to maintain an affective balance as a result. Indirect support stems from experiments showing that sleep deprivation decreases affective well-being and increases reactivity to stress (Dinges et al., 1997; Minkel et al., 2012). Research on the effects of excessive sleep is scarce. Worse general affective well- being and depressive symptoms have been reported together with habitual excessive sleeping (Globus, 1969; Kaplan & Harvey, 2009). It remains unclear, however, whether sleeping especially long during a single night is also associated with affective well- being the next morning, and, if so, what the underlying mecha- nisms could be.

The association between short sleep duration and low affective well-being is puzzling when we look at the age differences: Av- erage sleep duration becomes shorter with higher age (Krueger & Friedman, 2009; Ohayon, Carskadon, Guilleminault, & Vitiello, 2004), but affective well-being becomes higher (see review by Riediger & Rauers, in press)—not lower as one would expect from findings on consequences of short sleep duration in experimental

This article was published Online First February 10, 2014. Cornelia Wrzus, Max Planck Research Group Affect Across the Lifes-

pan, Max Planck Institute for Human Development, Berlin, Germany; Gert G. Wagner, German Institute for Economic Research, Berlin, Germany, Max Planck Institute for Human Development, and Technische Universität Berlin; Michaela Riediger, Max Planck Research Group Affect Across the Lifespan, Max Planck Institute for Human Development.

We thank Annette Brose, Gloria Luong, and Antje Rauers for their valuable comments on earlier versions of this article. We are grateful to Julia Delius for editorial assistance.

Correspondence concerning this article should be addressed to Cornelia Wrzus, Max Planck Research Group Affect Across the Lifespan, Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany. E-mail: [email protected]

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Emotion © 2014 American Psychological Association 2014, Vol. 14, No. 3, 624 – 628 1528-3542/14/$12.00 DOI: 10.1037/a0035349

624

or clinical studies. Although not undisputed (Vitiello, 2009), it has been argued that, in comparison with younger individuals, for at least some older people shorter average sleep duration can be linked to a reduced need for sleep and altered daily routines, as well as to age-related increases in health problems and sleep disturbances (Monk, 2005; Vitiello, 2009). In part, age-related changes in affective well-being are assumed to result from moti- vational changes—for example, an increasing focus on maintain- ing affective well-being—and from changes in handling daily life and the accompanying emotional states—for example, an increas- ing preference for interpersonal conflict avoidance (e.g., Charles & Carstensen, 2010; Riediger, Schmiedek, Wagner, & Lindenberger, 2009). The prominent theoretical position that the ability to regu- late one’s own emotions improves with age (e.g., Charles & Carstensen, 2010) is disputed (Isaacowitz & Blanchard-Fields, 2012), but has also found some first empirical support (e.g., Charles, Piazza, Luong, & Almeida, 2009; Larcom & Isaacowitz, 2009). The above-mentioned factors could also affect the associ- ation between sleep duration and affective well-being: If older people indeed need less sleep and are indeed better at handling their emotions than younger people are, it is possible that they are better able to tolerate shorter-than-average sleep durations, whereby their affective well-being would also be less affected.

Previous empirical evidence on such age differences is incon- clusive. Brendel et al. (1990) observed a stronger increase of negative affect after total sleep deprivation among 20-year-olds compared with 80-year-olds. Neither Talbot et al. (2010) nor Oginska and Pokorski (2006) found significant age differences in the association between average sleep duration and mood. These studies, however, addressed associations between people, which can be dissimilar to associations within persons over time (Mole- naar, 2004).

To contribute new insights into these questions, we therefore assessed sleep duration and momentary affect, after getting up, on several days in people’s daily life. We assumed that affective well-being the next morning would be lower when sleep duration is shorter than the person’s individual average, and at higher ages, people would be less affected when sleeping less than usual. This hypothesis is consistent with the theoretical proposal that emotion regulation may improve across adulthood, which would allow older adults to handle the affective consequences of inadequate sleep duration better than their younger counterparts (Charles & Carstensen, 2010). Another possibility could also be that older adults, irrespective of their affect-regulation ability, react less strongly to most negative affect-eliciting events (Charles & Carstensen, 2010), such as reduced sleep might be. In this case, we would also expect that reduced sleep would have less aversive consequences the older the persons are. Further, we explored potential age-related differences in the association between sleep- ing longer than usual and affective well-being the next morning.

Method

Participants

A fieldwork agency recruited 400 participants aged 12 to 88 years, who were approximately stratified by gender (48% women) and age group (M � 39.86 years, SD � 20.48; 12–17 years, n � 79; 18 –29 years, n � 82; 30 –39 years, n � 50; 40 – 49 years, n �

55; 50 –59 years, n � 46; 60 – 69 years, n � 55; 70 – 88 years, n � 33). Twenty-three percent of the 320 participants who had already completed school held a university degree. The final sample com- prised 397 participants due to drop out.

Experience Sampling Procedure

Mobile phones (Nokia E50) prompted participants six times a day for at least nine days to answer a short questionnaire displayed on the phone. The six assessments occurred in approximate 2-hr intervals—the exact timing being randomized so that participants were unaware when the next assessment was to occur. Participants chose, between 6 a.m. and 12 a.m., when the first assessment should occur (for details, see Riediger et al., 2009). The present analyses used information obtained during the first morning’s and the last evening’s assessment per day. Participants gave informed consent. The Ethics Committee of the Max Planck Institute for Human Development approved the study.

Experience Sampling Measures

Sleep duration was measured at the first assessment of each day with one of seven answer options: � 5 hr, 5 to � 6 hr, 6 to � 7 hr, 7 to � 8 hr, 8 to � 9 hr, 9 to � 10 hr, and � 10 hr. Assuming approximate equidistance between response options, we assigned the values 4.5 and 10.5 to the scale end points, and category means (e.g., 5.5, 6.5) to all other response options for further analyses. This transformation provided an approximation of sleep duration.

Affect balance. At each assessment, participants reported how they currently felt by rating six positive (happy, enthusiastic, energetic, even-tempered, content, relaxed; �average across days � .88) and six negative (tense, angry, nervous, tired, downcast, disappointed; �average across days � .79) affect adjectives on a scale from 0 (not at all) to 6 (very much). We computed the difference between the average positive and negative affects as an indicator of affect balance. Higher values indicated better mood.

Control variables. At each assessment, participants also re- ported their current activity (e.g., work, chores, leisure activity) and persons present (e.g., nobody, family, colleagues). The date and time of the assessment were also recorded. Before commenc- ing the Experience Sampling period, participants answered several questionnaires where they also rated their overall health (1 � very good to 5 � poor) and the severity of five broad health complaints: fatigue, sleep disturbances, heavy perspiration, heart trouble, mus- cle/joint problems (1 � no complaint to 5 � very strong com- plaint). These six questions were averaged to serve as one indica- tor of general health (� � .74) and revealed a generally high health status (M � 4.2, SD � 0.6). As an indicator of dysphoria we assessed three face-valid items (Sometimes my life barely seems worth living anymore; I’m now experiencing the most dismal period of my life; I’ve given up a lot of my interests and activities, from Life Evaluation Scale, Ferring, Filipp, & Schmidt, 1996). The items were rated on a scale 1 � does not apply to 7 � applies totally and averaged (M � 2.0, SD � 1.2, � � .70).

Results

Age Differences in Sleep Duration and Affect Balance

Participants reported their sleep duration for 8.6 nights on av- erage (SD � 1.4). The chosen median category was 6 to � 7 hr.

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625SLEEP AND MOOD

The average sleep duration was estimated at 6.8 hr (SD of person Ms � 0.9, within-person range of sleep duration M � 2.5 hr, SD � 1.3). Age differences in average sleep duration followed a U-shaped curve as indicated by the significant linear �age � �.23, p � .001 and quadratic age effects �age2 � .20, p � .001. Computed average sleep duration for three selected ages illustrate this non- linear effect: 7.3 hr for 12- to 17-year-olds, 6.5 hr for 40- to 49-year-olds, and 6.8 hr for 60- to 88-year-olds. As in previous studies, participants reported a better mood the older they were: average affect balance in the mornings M � 1.49, SD � 1.29, rage � .32, p � .001; average affect balance in the evenings M � 1.80, SD � 1.33, rage � .22, p � .001. There were no significant quadratic age effects.

Age Differences in the Association Between Sleep Duration and Affect Balance

As measurements of sleep duration and affect on specific days (Level 1) were nested within persons (Level 2), we specified random coefficient models in HLM 6.00 (Raudenbush, Bryk, & Congdon, 2004), using full information maximum likelihood and robust standard error estimation (cf. Raudenbush & Bryk, 2002). The dependent variable of affect balance at the first measurement in the morning was predicted by linear and squared sleep duration and affect balance from the previous night (Level 1). Sleep duration was centered at each individual’s mean to control for age differences in average sleep duration (Ohayon et al., 2004). The age of participants (centered on the sample mean) was used as continuous linear and squared Level-2 predictors of affect balance and the association with sleep duration. We initially included all interactions between sleep duration, affect, and age, and then omitted nonsignificant effects from the model in the interest of parsimony.

The results summarized in Table 1 show that affect balance in the morning was related nonlinearly to the duration of the previous night’s sleep and that this relationship differed by age. Figure 1 illustrates this age moderation exemplarily for three selected ages, namely: 12 years of age (adolescence), 40 years of age (middle adulthood), and 70 years of age (older adulthood). When sleeping

shorter than their individual average, people reported lower affect balance in the morning. This linear effect differed with age and was most pronounced for adolescents and older adults, but significant across the entire studied age range—as confirmed by region of sig- nificance analysis (Preacher, Curran, & Bauer, 2006). Comparing the estimated differences in affective well-being on mornings after nights with average sleep duration and nights with 1-hr less sleep than average illustrates the size of the respective age moderation. Affective well-being was 0.3 standard units lower for adolescents, 0.2 lower for middle-aged adults, and 0.5 lower for older adults.

Interestingly, people also reported lower affect balance in the morning when their sleep duration was longer than their individual average—as indicated by the quadratic effect of sleep duration (see Table 1). The region of significance analyses (Preacher et al., 2006) showed that this quadratic effect of sleep duration was significant for participants older than 20.7 years and more pro- nounced with higher age (see Figure 1). To illustrate the size of the effect, we now chose a value that corresponds to sleeping in: When people slept 3 hr more than average (i.e., about 10 hr), adolescents’ affective well-being was 0.6 standard units higher than after average sleep duration, whereas middle-aged and older adults’ well-being were each 0.3 standard units lower; the latter effect sizes were similar due to age differences in standard deviations used for computing effect sizes (see Figure 1 for effects of 1-hr and 2-hr additional sleep). Effects of sleep duration on affect balance in the morning and the accompanying age effects were robust when controlling for evening affect, current activities, present persons, average sleep duration, self-rated health, and dysphoria (see online supplementary material Table S1 for results from these control analyses). Also, the effects of sleep duration on the sum- mary measure of affect balance remained when analyzing positive and negative affects separately (see online supplementary material Figure S1 and S2).

Finally, we reversed the order of prediction, but found that affect balance for the previous night did not significantly predict the amount of sleep during the following night (b � 0.01, SE � 0.02, p � .66). There were no significant linear or quadratic age effects.

Table 1 Affect Balance in the Morning Predicted From Sleep Duration and Age (Unstandardized Multilevel Regression Coefficients)

Morning affective balance

b (SE)

Intercept 1.172�� (0.096) Agea 0.009� (0.004) Age2a �0.0003� (0.0001) Sleep durationb 0.147�� (0.058) Sleep durationb � Agea 0.002 (0.002) Sleep durationb � Age2a 0.0003� (0.0001) Sleep duration2b �0.103�� (0.028) Sleep duration2b � Agea �0.003� (0.001) Evening affective balance 0.262�� (0.024) Evening affective balance � Agea 0.005�� (0.001)

Note. Nonsignificant quadratic age effects were omitted from the model, see Results section. SE in brackets. a Grand-mean centered (deviations from sample mean). b Group-mean centered (deviations from individual’s mean). � p � .05. �� p � .01.

Figure 1. Model-predicted affect balance the next morning related to differences in sleep duration for three example age groups: adolescents, middle-aged adults (sample mean age), and older adults.

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626 WRZUS, WAGNER, AND RIEDIGER

Predictors of the Age-Differential Effect of Longer- Than-Average Sleep Duration

In a next step, we probed possible explanations for the observed age-differential effect on affective well-being when sleeping lon- ger than usual. First, we addressed differences in assessment times. Age was not significantly associated with the time window for the first assessment chosen by each participant individually (M � 8:50 a.m., SD � 1:24, rage � �.03, p � .30) or with the actual times of the first assessment (M � 9:27 a.m., SD � 1:24, rage � �.03, p � .27). Also, the reported age differences in effects of sleep duration on affect balance were robust when controlling for individual assessment commencement or actual time of assessments.

Second, we explored the role of health impairments and dys- phoria for sleeping longer than an average. That people sleep more when they are not feeling well, physically or mentally, could explain the observed age-differential effects of sleeping longer than usual on affective well-being. As expected, with higher age, participants reported lower self-reported general health (r � �.38, p � .001), but age was not significantly related to self-reported dysphoria (r � .01, p � .42). Self-reported health was not signif- icantly related to the occurrence of sleeping 2 hr or more in addition to one’s average sleep duration (b � �0.13, SE � 0.23, p � .58, OR � 0.88; bage � 0.02, SE � 0.01, p � .09, OR � 1.02). For people older than 38.1 years, higher self-reported dysphoria predicted more frequent occurrences of sleeping 2 hr or more in addition to one’s average sleep duration (b � 0.20, SE � 0.09, p � .03, OR � 1.22; bage � 0.01, SE � 0.005, p � .02, OR � 1.01). Neither health nor dysphoria, however, predicted the association between sleep duration and affective well-being in the morning. Also, the previously reported age effects on the association be- tween sleep and well-being remained robust (see online supple- mentary material Table S1).

Third, we analyzed sleep duration on previous nights. In two separate multilevel logistic regressions, person-mean centered sleep duration one or two nights ago, respectively, was used to predict the occurrence of sleeping 2 hr or more than the average (1 � yes, 0 � no) in a given night. The shorter people slept one night ago, the more likely they were to sleep two or more hours longer than their average (b � �0.95, SE � 0.20, p � .001, OR � 0.39). This effect was more pronounced with age (b � �0.02, SE � 0.01, p � .03, OR � 0.98), and effects were similar for sleep duration two nights ago (b � �1.63, SE � 0.33, p � .001, OR � 0.20; bage � �0.03, SE � 0.01, p � .03, OR � 0.97). The deviations from the average sleep duration one or two nights ago were not significantly related (b � �0.003, SE � 0.03, p � .93). If older people do not “recover” from sleep deprivation during just one night of extended sleep and continue not to feel well, this could be one of the reasons for the observed association between sleeping longer than usual and lower affective well-being espe- cially among adults, but not adolescents. Including sleep depriva- tion/surplus during previous nights (deviation in sleep duration from the average either one or two nights ago) in the model presented in Table 1, however, neither changed the association between sleeping longer than usual, lower affective well-being, and age, nor proved to be a significant predictor of affective well-being (blast night � 0.001, SE � 0.04, p � .99; btwo nights ago � 0.002, SE � 0.05, p � .97; no significant age moderations).

Discussion

The current results extend previous findings that experimentally induced sleep deprivation impairs affective well-being (Brendel et al., 1990; Dinges et al., 1997) in important ways: (a) Naturally occurring variations in sleep duration across on average 9 days were significantly related to people’s affect the next morning. This is especially important because long sleep duration is difficult to induce experimentally without medication that also influences affect. (b) Age differences in the association between sleep dura- tion and well-being were multifaceted: Sleeping shorter than average was more strongly related to lower affective well-being among adolescents and older people than among middle-aged adults. This is partly consistent with our assumption that, com- pared with adolescents, adults are better able to tolerate sleep deficits perhaps because their sleep need is lower and their emo- tion regulation is more pronounced. Unexpectedly, there seemed to be an upper age limit because shorter-than-average sleep duration among older adults’ was more strongly related to lower well-being compared with middle-aged adults. Perhaps decreased flexibility in dealing with variations in sleep duration (Monk, 2005) contrib- utes to this effect.

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