The literature emphasizes depression and poor sleep quality as problems that affect many elderly individuals. However, these problems have been related in few studies and there is no meta-analysis performed so far on this relationship. The present research reviewed the studies performed on the subjective sleep quality in order to understand how it relates to depression in older adults. The review was conducted in January 2016 and comprised publications between 2005 and 2015. Based on the electronic databases Web of Science and EBSCO, we used the keywords ‘sleep quality’, ‘depression’, and ‘older’ to identify the empirical studies performed. After assessing the collected studies, we selected those that presented the elderly as participants, resulting in nine papers (N = 3069). A random-effects method was used to evaluate the relationship between depression and sleep. We found that an older person’s lack of good sleep quality is significantly related with depression. The main limitation of this study was the difficulty in collecting a greater number of studies. Future research should consider the importance of additional variables (e.g. moderators) in order to understand and investigate viable interventions for prevention and health promotion in the elderly.

Although the relationship between motivation (especially intrinsic motivation) and creativity (especially as a product), no meta-analyses have been conducted on the relationship between these 2 concepts. This study aimed to analyze the relationship between intrinsic motivation and creativity related to product (i.e., creative outcomes) through meta-analytical procedures. Fifteen papers were analysed, including 26 independent samples (N = 6,435 participants). The results revealed a significant positive relationship between intrinsic motivation and creativity related to product ( = .30, 95% CI = [.22, .37]). The homogeneity tests indicated that this relationship was influenced by some moderators such as type of research design. Cross-sectional studies report a significantly stronger association between the two concepts compared to those that used a causality-oriented design; t(24) = 4.86, p = .001. Also, there were no significant differences between students and employees samples regarding this relationship; t(24) = .45, p = .66. These results have implications for settings where creativity related to product is essential. Based on the limits of this study, several research directions on the topic of motivation and creativity are presented.