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Related Experiment Video

Updated: Feb 20, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

Published on: August 8, 2019

School start time changes and sleep patterns in elementary school students.

Erica R Appleman¹, Karina Stavitsky Gilbert², Rhoda Au³

¹Department of Psychological and Brain Sciences, Boston University, 648 Beacon Street 2nd Floor, Boston, MA 02215 USA.

|October 27, 2017

Summary

Changing elementary school start times earlier did not reduce overall sleep duration. This study examined sleep patterns in students before and after an earlier school start time was implemented.

Keywords:

Child sleep habits Sleep durations Sleep hygiene

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Last Updated: Feb 20, 2026

Collecting Sleep, Circadian, Fatigue, and Performance Data in Complex Operational Environments

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Human Circadian Phenotyping and Diurnal Performance Testing in the Real World

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Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil

Breakfast Habits among Schoolchildren in the City of Uruguaiana, Brazil

Published on: July 29, 2020

Area of Science:

Pediatric sleep medicine
Educational policy
Chronobiology

Background:

Early school start times are associated with sleep deprivation in adolescents.
Elementary school start times have been less studied regarding sleep impacts.

Purpose of the Study:

To investigate the impact of a district-wide earlier school start time on sleep patterns in elementary school students.
To assess changes in sleep duration, wake times, and sleepiness after a shift in school start times.

Main Methods:

A cohort of 689 third- to fifth-grade students completed sleep surveys in 2009 (pre-change) and 625 in 2010 (post-change).
The school start time shifted from 8:20 am to 7:45 am in Fall 2009.
Descriptive statistics were used to analyze sleep survey responses by grade level.

Main Results:

Third graders reported an average increase of 24 minutes in total sleep time.
Fourth and fifth graders experienced a decrease of 4 and 9 minutes in average sleep time, respectively.
Weekend later wake and bedtimes decreased, and sleepiness increased slightly in fifth graders post-change.

Conclusions:

The implemented change in elementary school start times did not result in a decrease in total sleep duration.
This study provides novel insights into the effects of early school start times on younger students' sleep.