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Published on: October 2, 2019
How staying in a gymnasium affects sleep and bed climate in children
Kazue Okamoto-Mizuno1, Koh Mizuno2
1Faculty of Human Ecology, Wayo Women's University, 2-3-1 Konodai, Ichikawa, Chiba, 272-8533, Japan. k-mizuno@wayo.ac.jp.
Insights
Children’s sleep quality in a simulated shelter was poor due to higher ambient humidity and a delayed chest-area bed climate temperature increase. This led to heat disturbance and reduced sleep efficiency and duration.
Area of Science:
- Environmental Science
- Sleep Science
- Pediatric Health
Background:
- Investigated the impact of ambient and bed climate on sleep in school-aged children.
- Utilized a simulated shelter environment for controlled observation.
Purpose of the Study:
- To demonstrate the effects of ambient and bed climate on sleep patterns in children.
- To identify factors contributing to disturbed sleep in a shelter setting.
Main Methods:
- Monitored ambient temperature and humidity in a gymnasium and homes.
- Measured bed climate (chest and foot areas) and evaluated sleep using actigraphy.
- Collected subjective reports on sleep and thermal sensations.
Main Results:
- Simulated shelter conditions (C) showed higher ambient humidity and a delayed increase in chest-area bed temperature.
- Sleep efficiency and duration were significantly reduced in the shelter.
- Children reported heat disturbance and exited sleeping bags due to discomfort.
Conclusions:
- Disturbed sleep in simulated shelters is linked to delayed chest-area bed climate warming.
- Children's behavior (avoiding sleeping bags) and delayed skin temperature increase contribute to sleep disruption.
Background:
We investigated the relationship between sleep, ambient climate, and bed climate in school-aged children during a one-night stay in a simulated shelter in a gymnasium to demonstrate the effect of ambient climate, and bed climate on sleep.
Methods:
We obtained measurements during a one-night stay in a school gymnasium (C), days before C (BC), on the day after (A1), and on the second day after C (A2) in 13 healthy school-aged children during summer. Sleep was evaluated using an actigraph, and the temperature and humidity of the bedrooms in the participants' homes and in the gymnasium were monitored for 3 days before and after C. The bed climate of the chest and foot areas was measured for two nights before and after C. The participants were asked to report on their subjective sleep estimations and thermal sensations two nights before and after C.
Results:
The ambient temperature in C was significantly higher than that in BC at the initial 180 min, while it significantly decreased compared to A1 and A2 in the last 100 min. The ambient humidity was significantly higher in both C and BC compared to A1 and A2. The sleep efficiency index decreased significantly in C (43±4.8%) compared to other conditions. Sleep time was significantly shorter in C than in other conditions during the initial 195 min. The increase in the bed climate temperature of the chest area in C was significantly delayed compared to that in the other conditions, around the initial 30 min after the lights were off. Subjective estimation revealed that in C, 85% of the participants were out of their sleeping bag at sleep onset, and their sleep was disturbed by heat (77%).
Conclusions:
Our study revealed that the disturbed sleep patterns observed with children in a simulated shelter may be related to a delayed increase in bed climate temperature in the chest area. This delayed increase could be related to the children not entering the sleeping bag and a delayed chest skin temperature increase during the sleep onset period.
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