Estimating dim light melatonin onset (DLMO) phase in adolescents using summer or school-year sleep/wake schedules.

Full Abstract

STUDY

OBJECTIVES:
This analysis examined associations between the salivary dim light melatonin onset (DLMO) phase and self-selected sleep/ wake schedules in groups of children and adolescents during summer vacation and during the school year to determine the degree to which sleep/wake patterns can estimate salivary DLMO phase.

DESIGN AND SETTING:
Participants slept at home on self-selected schedules for 5 consecutive nights and reported their bedtime and wake-up time via daily telephone messages. Salivary melatonin was sampled in the laboratory on one evening every 30 minutes in dim light (< 50 lux) to determine DLMO phase. Within group bivariate regressions between sleep pattern measures (bedtime, wake-up time, and midsleep time) and DLMO phase were computed.

PARTICIPANTS:
One group, ages 9 to 17 years (mean age = 12.5, SD = 2.3 years, 74 males, 75 females) contributed 149 DLMO phase and sleep/wake pattern measures while on a school year schedule ("school group"). A separate group, ages 9 to 16 years (mean age = 13.1, SD = 1.3 years, 30 males, 29 females) contributed 59 DLMO phase and sleep/wake pattern measures while on a summer schedule ("summer group").

RESULTS:
Bedtime, midsleep time, and wake-up time were positively correlated with DLMO phase in both groups. Although all correlation coefficients for the summer group were statistically greater compared to the school group, the regression equations predicted DLMO phase within +/- 1 hour of the measured DLMO phase in approximately 80% for both groups.

CONCLUSIONS:
DLMO phase can be estimated using self-selected sleep/wake patterns during the school year or summer vacation in healthy children and adolescents.

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Author information

Author/s: Crowley, Stephanie J (SJ); Acebo, Christine (C); Fallone, Gahan (G); Carskadon, Mary A (MA);

Affiliation: Department of Psychology, Brown University, Providence, RI, USA. Stephanie_Crowley(-atsign-)Brown.edu

Grants: AA13252 (Agency:NIAAA NIH HHS) ; MH52415 (Agency:NIMH NIH HHS) ; NR04270 (Agency:NINR NIH HHS) ; NR08381 (Agency:NINR NIH HHS)

Journal and publication information

Publication Type: Journal Article; Research Support, N.I.H., Extramural

Journal: Sleep (Sleep), published in United States. (Language: eng)

Reference: 2006-Dec; vol 29 (issue 12) : pp 1632-41

Dates: Created 2007/01/26; Completed 2007/03/13; Revised 2007/12/03;

PMID: 17252895, status: MEDLINE (last retrieval date: 12/26/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adolescent
Child
Circadian Rhythm - physiology
Female
Humans
Light

Male
Melatonin - analysis; metabolism
Saliva - chemistry
Seasons
Sleep Disorders, Circadian Rhythm - diagnosis; epidemiology; metabolism
Students - statistics & numerical data

Associated Chemicals: Melatonin (73-31-4)

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