Nancy Hazen

National Sleep Foundation’s sleep time duration recommendations: methodology and results summary

OBJECTIVE The objective was to conduct a scientifically rigorous update to the National Sleep Foundations sleep duration recommendations. METHODS The National Sleep Foundation convened an 18-member multidisciplinary expert panel, representing 12 stakeholder organizations, to evaluate scientific literature concerning sleep duration recommendations. We determined expert recommendations for sufficient sleep durations across the lifespan using the RAND/UCLA Appropriateness Method. RESULTS The panel agreed that, for healthy individuals with normal sleep, the appropriate sleep duration for newborns is between 14 and 17 hours, infants between 12 and 15 hours, toddlers between 11 and 14 hours, preschoolers between 10 and 13 hours, and school-aged children between 9 and 11 hours. For teenagers, 8 to 10 hours was considered appropriate, 7 to 9 hours for young adults and adults, and 7 to 8 hours of sleep for older adults. CONCLUSIONS Sufficient sleep duration requirements vary across the lifespan and from person to person. The recommendations reported here represent guidelines for healthy individuals and those not suffering from a sleep disorder. Sleep durations outside the recommended range may be appropriate, but deviating far from the normal range is rare. Individuals who habitually sleep outside the normal range may be exhibiting signs or symptoms of serious health problems or, if done volitionally, may be compromising their health and well-being.

National Sleep Foundation's updated sleep duration recommendations: final report ☆

OBJECTIVE To make scientifically sound and practical recommendations for daily sleep duration across the life span. METHODS The National Sleep Foundation convened a multidisciplinary expert panel (Panel) with broad representation from leading stakeholder organizations. The Panel evaluated the latest scientific evidence and participated in a formal consensus and voting process. Then, the RAND/UCLA Appropriateness Method was used to formulate sleep duration recommendations. RESULTS The Panel made sleep duration recommendations for 9 age groups. Sleep duration ranges, expressed as hours of sleep per day, were designated as recommended, may be appropriate, or not recommended. Recommended sleep durations are as follows: 14-17 hours for newborns, 12-15 hours for infants, 11-14 hours for toddlers, 10-13 hours for preschoolers, 9-11 hours for school-aged children, and 8-10 hours for teenagers. Seven to 9 hours is recommended for young adults and adults, and 7-8 hours of sleep is recommended for older adults. The self-designated basis for duration selection and critical discussions are also provided. CONCLUSIONS Consensus for sleep duration recommendations was reached for specific age groupings. Consensus using a multidisciplinary expert Panel lends robust credibility to the results. Finally, limitations and caveats of these recommendations are discussed.

The development of children's representations of large-scale environments.

HAZEN, NANCY L.; LOCKMAN, JEFFREY J.; and PICK, HERBERT L., JR. The Development of Childrens Representations of Large-Scale Environments. Cmum DEVELOPMENT, 1978, 49, 623-636. In an investigation of childrens spatial knowledge of a large-scale environment, 3-6-year-old children were taken through an environment by a specified route. Once the route and landmarks along the route were learned, children were tested on their ability to (1) travel the route in reverse (route-reversal knowledge), (2) name the sequence of landmarks along the reverse route (landmark-reversal knowledge), (3) infer the relationship between parts of the environment not directly traveled between (inference knowledge), and (4) construct a model of the environment. Results indicated that route-reversal knowledge develops before landmark-reversal knowledge, and inference ability develops last; the results also suggested that young childrens spatial representations are routelike and poorly integrated in comparison with those of older children. Furthermore, the results of the model-construction task indicated that the ability to coordinate knowledge of the route, sequence of landmarks, and shape of the layout may be a prerequisite for formation of an accurate spatial representation.

Does expectant mothers' unresolved trauma predict frightened/frightening maternal behavior? Risk and protective factors

This prospective, longitudinal study explored the relationship between mothers unresolved/disorganized (U/d) attachment status and frightened/frightening (FR) maternal behavior and investigated possible variations due to whether mothers were U/d for loss versus abuse. The role of other factors that might predict maternal FR behavior was also examined. Pregnant women (n = 116) were administered the Adult Attachment Interview and later observed at home for 30-40 min interacting with their first-born 8-month-olds. Women classified as U/d with respect to loss and/or abuse displayed substantially higher levels of FR behavior with their infants than did mothers who were not classified as U/d (i.e., secure/autonomous, dismissing, or preoccupied), but these groups did not differ on maternal sensitivity. Mothers classified as U/d who had a secondary secure/autonomous classification also showed FR behavior but at low levels than U/d-insecure mothers. Independent of U/d status, mothers who had lost a parent, versus those who did not, more often displayed FR behavior with their infants. Finally, U/d loss fully mediated the association between loss of an attachment figure other than the parent and FR behavior, and partially mediated the relationship between loss of a parent and FR behavior.

National Sleep Foundation's sleep quality recommendations: first report

Objectives: To provide evidence‐based recommendations and guidance to the public regarding indicators of good sleep quality across the life‐span. Methods: The National Sleep Foundation assembled a panel of experts from the sleep community and representatives appointed by stakeholder organizations (Sleep Quality Consensus Panel). A systematic literature review identified 277 studies meeting inclusion criteria. Abstracts and full‐text articles were provided to the panelists for review and discussion. A modified Delphi RAND/UCLA Appropriateness Method with 3 rounds of voting was used to determine agreement. Results: For most of the sleep continuity variables (sleep latency, number of awakenings >5 minutes, wake after sleep onset, and sleep efficiency), the panel members agreed that these measures were appropriate indicators of good sleep quality across the life‐span. However, overall, there was less or no consensus regarding sleep architecture or nap‐related variables as elements of good sleep quality. Conclusions: There is consensus among experts regarding some indicators of sleep quality among otherwise healthy individuals. Education and public health initiatives regarding good sleep quality will require sustained and collaborative efforts from multiple stakeholders. Future research should explore how sleep architecture and naps relate to sleep quality. Implications and limitations of the consensus recommendations are discussed.

Pathways to earned-security: The role of alternative support figures

This study explored the kinds of relationship experiences associated with earned-security, i.e., the extent to which mothers who report early negative relationship histories with their parents are later able to form a secure working model of attachment (indicated by the ability to speak clearly and coherently about these histories). Mothers from a low-risk sample (N = 121) expecting their first child completed the Adult Attachment Interview (AAI), which was used to assess earned-security retrospectively using the stringent definition recommended by Main and Hesse (Hesse, 2008; Main, Goldwyn, & Hesse, 2002), as well as to identify alternative support figures. Participants also completed self-report measures of depressive symptomatology, questionnaires concerning their experiences in therapy, and later, when their babies were 12 to 15 months old, the Strange Situation procedure. Sixteen mothers were classified as earned-secure (25% of those classified as secure-autonomous and 13% of the whole sample). Women who were earned-secure (vs. insecure and continuous-secure) reported significantly higher levels of emotional support, but not instrumental support, from alternative support figures. They also spent more time in therapy than did insecure and continuous-secure women and were more likely to form secure attachments with their infants than insecure women. These findings were obtained even after controlling for depressive symptoms.

Fathers’ frightening behaviours and sensitivity with infants: relations with fathers’ attachment representations, father–infant attachment, and children’s later outcomes

This longitudinal study of 125 families investigated whether negative child outcomes related to fathers’ frightening (FR) behaviours with infants would be mitigated if fathers were also sensitive. Results indicated that children whose fathers were frightening and insensitive with them during infancy showed the highest emotional under‐regulation at 24 months and highest teacher ratings of attention problems at age 7, whereas those whose fathers were frightening and sensitive did not differ from children whose fathers were sensitive but not frightening. Sensitive caregiving mitigated the negative impact of FR behaviours on child outcomes for fathers, but not mothers. Perhaps fathers who can be sensitive but also engage in stimulating, albeit frightening, interactions with their infants may actually be scaffolding their ability to regulate their affect in intensely emotional situations. FR behaviours by mothers may be more problematic for child outcomes since these behaviours conflict with the primary caregiver’s role of providing comfort.

Peer Exclusion in Preschool Children's Play: Naturalistic Observations in a Playground Setting.

To better understand peer exclusion in young children, 42 four- to six-year-olds were observed in an outdoor setting, and their verbalizations were recorded using wireless microphones. The frequency of peer exclusion and social aggression, the various techniques children used to exclude their peers (unmitigated, mitigated, ignoring, and planning exclusion) and the relation of gender and social status (acceptance, rejection, and dominance scores) to children’s use of exclusion were examined. Peer exclusion occurred frequently, whereas nonexclusionary forms of social aggression were rare. More dominant boys, less rejected boys, and more rejected girls excluded peers more frequently than did other children. Children who were more socially accepted tended to more frequently ignore their peers to exclude them. All girls and boys who were more socially accepted used higher rates of mitigated, subtle forms of exclusion. In addition, boys who were more dominant used higher rates of unmitigated, direct peer exclusion.

Spatial Orientation: A Comparative Approach

Those of us who have been known to get lost in our own neighborhoods cannot fail to be awed by the often remarkable feats of spatial orientation and memory performed by members of other species and other human cultures. Consider two examples, the first cross-species and the second cross-cultural.

Marital, Parental, and Whole-Family Predictors of Toddlers' Emotion Regulation: The Role of Parental Emotional Withdrawal.

The present study aims to address how dyadic and triadic family interactions across the transition to parenthood contribute to the later development of toddlers’ adaptive emotion regulation using structural equation modeling methods. Specifically, we examined the interrelations of observed marital negative affect before childbirth, parents’ emotional withdrawal during parent–infant interactions at 8 months, and coparenting conflict at 24 months as predictors of toddlers’ adaptive emotion regulation at 24 months. Data for the present study were drawn from a longitudinal dataset in which 125 families were observed across the transition to parenthood. Results suggested that prenatal marital negativity predicted mothers’ and fathers’ emotional withdrawal toward their infants at 8 months postbirth as well as coparenting conflict at 24 months postbirth. Coparenting conflict and father–infant emotional withdrawal were negatively associated with toddlers’ adaptive emotion regulation; however, mother–infant emotional withdrawal was not related. The implications of our study extend family systems research to demonstrate how multiple levels of detrimental family functioning over the first 2 years of parenthood influence toddlers’ emotion regulation and highlight the importance of fathers’ emotional involvement with their infants.