Caitlin E Gasperetti1, Emily A Dolsen1, Allison G Harvey2. 1. Department of Psychology, University of California, Berkeley, United States. 2. Department of Psychology, University of California, Berkeley, United States. Electronic address: aharvey@berkeley.edu.
Abstract
STUDY OBJECTIVES: The aim of the present study is to examine the relationship between light and sleep, in adolescents with an evening circadian preference. METHODS: For a period of seven days, ninety-nine adolescents wore a wrist actigraph to assess light exposure and objective sleep and completed a sleep diary to assess subjective sleep. RESULTS: Lower average light intensity across the preceding 24 h was associated with a later sleep onset (p < 0.01) and a later next-day sleep offset (p < 0.05). A later time of last exposure to more than 10 lux was associated with a later sleep onset (p < 0.001) and a shorter objective total sleep time (p < 0.001), as well as a later bedtime (p < 0.001) and a shorter subjective total sleep time (p < 0.001). Furthermore, exploratory analyses found that lower average early morning light exposure (between 4 and 9 AM) was associated with later sleep onset (p < 0.05), a later next-day sleep offset (p < 0.05), and a later next-day waketime (p < 0.01), lower average afternoon light exposure (between 2 and 7 PM) was associated with a later next-day sleep offset (p < 0.05), and lower average evening light exposure (between 7 PM and 12 AM) was associated with longer subjective total sleep time (p < 0.01). CONCLUSION: This study highlights the importance of light exposure, particularly the timing of light exposure, for establishing healthy patterns of sleep among adolescents with a propensity for a delayed bedtime and waketime. These findings provide additional evidence for targeting light exposure when designing interventions to improve adolescent sleep.
STUDY OBJECTIVES: The aim of the present study is to examine the relationship between light and sleep, in adolescents with an evening circadian preference. METHODS: For a period of seven days, ninety-nine adolescents wore a wrist actigraph to assess light exposure and objective sleep and completed a sleep diary to assess subjective sleep. RESULTS: Lower average light intensity across the preceding 24 h was associated with a later sleep onset (p < 0.01) and a later next-day sleep offset (p < 0.05). A later time of last exposure to more than 10 lux was associated with a later sleep onset (p < 0.001) and a shorter objective total sleep time (p < 0.001), as well as a later bedtime (p < 0.001) and a shorter subjective total sleep time (p < 0.001). Furthermore, exploratory analyses found that lower average early morning light exposure (between 4 and 9 AM) was associated with later sleep onset (p < 0.05), a later next-day sleep offset (p < 0.05), and a later next-day waketime (p < 0.01), lower average afternoon light exposure (between 2 and 7 PM) was associated with a later next-day sleep offset (p < 0.05), and lower average evening light exposure (between 7 PM and 12 AM) was associated with longer subjective total sleep time (p < 0.01). CONCLUSION: This study highlights the importance of light exposure, particularly the timing of light exposure, for establishing healthy patterns of sleep among adolescents with a propensity for a delayed bedtime and waketime. These findings provide additional evidence for targeting light exposure when designing interventions to improve adolescent sleep.
Authors: Mirja Quante; Sara Mariani; Jia Weng; Catherine R Marinac; Emily R Kaplan; Michael Rueschman; Jonathan A Mitchell; Peter James; J Aaron Hipp; Elizabeth M Cespedes Feliciano; Rui Wang; Susan Redline Journal: Chronobiol Int Date: 2018-10-26 Impact factor: 2.877
Authors: Allison G Harvey; Kerrie Hein; Emily A Dolsen; Lu Dong; Sophia Rabe-Hesketh; Nicole B Gumport; Jennifer Kanady; James K Wyatt; Stephen P Hinshaw; Jennifer S Silk; Rita L Smith; Monique A Thompson; Nancee Zannone; Daniel Jin Blum Journal: J Am Acad Child Adolesc Psychiatry Date: 2018-08-15 Impact factor: 13.113