| Records |
| Author |
Peixoto, C.A.T.; da Silva, A.G.T.; Carskadon, M.A.; Louzada, F.M. |
| Title |
Adolescents living in homes without electric lighting have earlier sleep times |
Type |
Journal Article |
| Year |
2009 |
Publication |
Behavioral Sleep Medicine |
Abbreviated Journal |
Behav Sleep Med |
| Volume |
7 |
Issue |
2 |
Pages |
73-80 |
Keywords  |
Human Health; Sleep |
| Abstract |
The aim of this project was to compare circadian rhythmicity of a group of 37 adolescents (14 girls), aged 11 to 16 (mean age = 13.1 +/- 1.7 years), with and without electricity at home. Twenty students attended morning school (07:30-11:30), and 17 attended evening school classes (19:00-22:30). Eleven adolescents had no electric lighting at home (5 attended morning classes and 6 attended evening classes). They completed a sleep log and wore a wrist actigraph for 5 consecutive days. Saliva samples were collected to assess DLMO. Data were compared by ANOVA and showed later timing and a more extended sleep period for those who attended late classes. Those adolescents without electricity at home had significantly earlier sleep onset on school days. As to DLMO, a trend to a delay was observed in the groups who had electric lighting. |
| Address |
Department of Physiology, Universidade Federal do Parana, Brazil. pedatardelli@yahoo.com.br |
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| Language |
English |
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| ISSN |
1540-2002 |
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| Notes |
PMID:19330580 |
Approved |
no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1481 |
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| Author |
Pereira, É.F.; Louzada, F.M.; Moreno, C.R.C. |
| Title |
Not all adolescents are sleep deprived: A study of rural populations: Sleep duration in rural populations |
Type |
Journal Article |
| Year |
2010 |
Publication |
Sleep and Biological Rhythms |
Abbreviated Journal |
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| Volume |
8 |
Issue |
4 |
Pages |
267-273 |
| Keywords |
Human Health; Sleep |
| Abstract |
The objective of this study was to investigate the role of environmental factors in sleep duration among adolescents living in rural areas. A total of 1140 students (569 males), aged 10–19 years, and attending two schools in rural regions in southern Brazil, completed a questionnaire about their sleep habits. Demographic data were also obtained. Prevalence ratios (PR) were estimated for the cases of more than 9 h of sleep on weekdays. Sleep duration in adolescents with and without electric lighting at home was analyzed. Average sleep duration at night was 9.63 (1.64) h on school-going days and 10.14 (2.42) h on weekends. The prevalence of adolescents sleeping for more than 9 h at night on school-going days was 58.3%. Older adolescents showed a tendency to delay their sleep onset times, which is associated with a reduction of sleep duration. Adolescents without electric lighting at home slept longer on school-going days (P < 0.001) and on weekends (P= 0.013) when compared to those with electric lighting at home. From multivariate analysis, age (P < 0.001), school schedule (P= 0.007) and work (0.042) were factors affecting sleep duration. In contrast to the data previously reported for urban populations, we found a high prevalence of adolescents sleeping for more than 9 h on school nights. Data on populations living in less industrialized regions reinforce the idea that technological advances are associated with the negative impact of sleep phase delay in adolescents. |
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1446-9235 |
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no |
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LoNNe @ kyba @ |
Serial |
1482 |
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| Author |
Choi, S. J., Park, H. R. & Joo, E. Y. |
| Title |
Effects of Light on Daytime Sleep in 12 Hours Night Shift Workers: A Field Study |
Type |
Journal Article |
| Year |
2019 |
Publication |
Korean Sleep Research Society |
Abbreviated Journal |
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| Volume |
16 |
Issue |
1 |
Pages |
26-35 |
| Keywords |
Human Health; Sleep |
| Abstract |
Objectives: Night shift workers suffer from sleep and daytime disturbances due to circadian misalignment. To investigate the role of environmental light in daytime sleep following 12 h-night shift work. Methods: we enrolled 12 h-shift female nurses working at one university-affiliated hospital (n=10, mean age 26.6 years, shift work duration 3.8 years). This is a cross-over study to compare sleep between under light exposure (30 lux) and in the dark (<5 lux) following 12 h-night duty. Two sessions of experiments were underwent and the interval between sessions was about a month. Psychomotor vigilance test (PVT) had performed on awakening from sleep at each session and sleep-wake pattern had been monitored by actigraphy throughout the study period. Daytime sleep was also compared with night sleep of age-and gender matched daytime workers (n=10). Results: Sleep parameters and PVT scores were not different between two light conditions. Activities during sleep seemed to be more abundant under 30 lux condition than in the dark, which was not significant. Compared to night sleep, daytime sleep of shift workers was different in terms of rapid eye movement (REM) sleep. Three shift workers showed sleep onset REM sleep and first REM sleep period was the longest during daytime sleep. Conclusions: Unexpectedly, daytime sleep of 12 h night shift workers was well-maintained regardless of light exposure. Early occurrence of REM sleep and shorter sleep latency during daytime sleep suggest that shift workers meet with misalignment of circadian rhythm as well as increased homeostatic sleep pressure drive. |
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Korean |
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no |
| Call Number |
IDA @ intern @ |
Serial |
2635 |
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