Recuperative Power of a Short Daytime Nap With or Without Stage 2 Sleep

Hayashi, Mitsuo; Motoyoshi, Naoko; Hori, Tadao

doi:10.1093/sleep/28.7.829

Cited by 27 publications

(6 citation statements)

References 36 publications

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“…Not only night-time sleep but also daytime napping aroused a social reaction. Despite growing recognition of the benefits of daytime napping [e.g., 52 , 53 , 54 ], many still object to this practice. Afternoon nappers described some of the belittling comments they encountered.…”

Section: Resultsmentioning

confidence: 99%

Sleep as a familial and communal matter: a qualitative study of social norms around sleep health in Israel

Zarhin

2023

BMC Public Health

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Background A growing body of research has clarified that sleep is influenced not only by biological factors but also by social factors. While studies have shown that social norms can affect sleep behavior and sleeping arrangements, including when, where, how, and with whom people sleep, researchers still know relatively little about how social norms affect sleep health, especially among adults. The current study explores the association between social norms and sleep health in the Israeli context. Methods Data were drawn from semi-structured, in-depth interviews with 66 Israelis—including women and men, Arabs and Jews, and religious and non-religious persons—conducted between February 2020 and February 2022. This article focuses on responses to a set of questions about the comments people make or hear from others about their sleep. Exploring how people comment on the sleep of others highlights prevalent social norms around sleep. Results Findings indicate that how sleep is “done” is policed by family and community members who react to norm violations by commenting on what is perceived as “inappropriate” sleep behavior. Comments were made in jest or earnest in response to breaches of social norms regarding sleep timing, duration, continuity, and alertness/sleepiness, indicating that social norms and expectations shape each of these sleep health dimensions. Conclusions This article expands the scholarly understanding of the social determinants of sleep health. The study concludes that since individuals may opt to conform to current social norms, which are enforced by members of the family and community, interventions aimed at promoting sleep health should target not only individuals but also the family and community.

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Section: Resultsmentioning

confidence: 99%

Sleep as a familial and communal matter: a qualitative study of social norms around sleep health in Israel

Zarhin

2023

BMC Public Health

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Section: Discussionmentioning

confidence: 99%

“…Furthermore, short siestas are mainly composed of stages 1 and 2 of sleep. The transition to stage 1 sleep has been reported to lower blood pressure acutely [41], and stage 2 sleep (a minimum of 3‐minute stage) has been shown to play an important role in the restorative function of a nap [42]. Short siestas of less than 30 minutes, also called power naps, end before deep slow‐wave sleep onset and they have been shown to limit sleep inertia [43], increase reaction times, and improve memory performance [15, 44, 45].…”

Section: Discussionmentioning

confidence: 99%

Lifestyle mediators of associations among siestas, obesity, and metabolic health

Vizmanos

Cascales

Rodríguez‐Martín

et al. 2023

Obesity

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Objective The aim of this study was to determine the association between siestas/no siestas and obesity, considering siesta duration (long: >30 minutes, short: ≤30 minutes), and test whether siesta traits and/or lifestyle factors mediate the association of siestas with obesity and metabolic syndrome (MetS). Methods This was a cross‐sectional study of 3275 adults from a Mediterranean population (the Obesity, Nutrigenetics, TIming, and MEditerranean [ONTIME] study) who had the opportunity of taking siestas because it is culturally embedded. Results Thirty‐five percent of participants usually took siestas (16% long siestas). Compared with the no‐siesta group, long siestas were associated with higher values of BMI, waist circumference, fasting glucose, systolic blood pressure, and diastolic blood pressure, as well as with a higher prevalence of MetS (41%; p = 0.015). In contrast, the probability of having elevated SBP was lower in the short‐siesta group (21%; p = 0.044) than in the no‐siesta group. Smoking a higher number of cigarettes per day mediated the association of long siestas with higher BMI (by 12%, percentage of association mediated by smoking; p < 0.05). Similarly, delays in nighttime sleep and eating schedules and higher energy intake at lunch (the meal preceding siestas) mediated the association between higher BMI and long siestas by 8%, 4%, and 5% (all p < 0.05). Napping in bed (vs. sofa/armchair) showed a trend to mediate the association between long siestas and higher SBP (by 6%; p = 0.055). Conclusions Siesta duration is relevant in obesity/MetS. Timing of nighttime sleep and eating, energy intake at lunch, cigarette smoking, and siesta location mediated this association.

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“…Hayashi et al (2005) reported a recovery effect of short naps if at least 3 min were spent in N2, but no effect after only N1. The naps in this study were composed of a mean time of 5.1 min in N1, 8.3 min in N2, and 1.1 min in N3, indicating the likelihood of a recovery effect that would be effective in mitigating post‐nap sleepiness and increasing performance.…”

Section: Discussionmentioning

confidence: 99%

Effects of short naps during simulated night shifts on alertness and cognitive performance in young adults

Sakai

Kawamoto

Hayashi

2023

Journal of Sleep Research

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SummaryWhile short daytime naps have been found to provide alertness and performance benefits without inducing sleep inertia, the effects of a similar napping strategy during nights shifts are largely unknown. This study examined the effects of a 20‐min nap (scheduled at 2:00 a.m.) during night shifts among 16 participants (mean [SD] age 22.0 [1.08] years) who worked in a simulated night shift from midnight (12:00 a.m.) to morning (ending at 6:00 or 8:00 a.m.). The participants underwent both a ‘nap condition’ and a ‘no‐nap condition’ by engaging in repeated 10‐min tasks (four‐choice reaction time tasks and vigilance tasks) and 10‐min rest. The results showed that compared to the no‐nap condition, sleepiness was significantly lower in the nap condition between 3:20 and 5:20 a.m. (p < 0.05). The nap condition also yielded significantly better performance in the vigilance tasks between 2:40 and 5:40 a.m., except at 4:40 am (p < 0.05). However, no significant difference was found in sleepiness and performance in the vigilance task at 5:40 a.m. or immediately after the nap between the two conditions. The results showed that a 20‐min nap at 2:00 a.m. did not induce sleep inertia upon waking. Furthermore, it mitigated sleepiness and sustained work performance for 3 h after the nap. However, the effect of napping was no longer observed near the end of the night shift. Considering risks of falling asleep while driving home from work that may cause a traffic accident, further research should examine ways to mitigate sleepiness after a night shift.

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Recuperative Power of a Short Daytime Nap With or Without Stage 2 Sleep

Cited by 27 publications

References 36 publications

Sleep as a familial and communal matter: a qualitative study of social norms around sleep health in Israel

Sleep as a familial and communal matter: a qualitative study of social norms around sleep health in Israel

Lifestyle mediators of associations among siestas, obesity, and metabolic health

Effects of short naps during simulated night shifts on alertness and cognitive performance in young adults

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