Accuracy of self-reported sleep position in late pregnancy
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(Published version)
Date
2014
Authors
Warland, J.
Dorrian, J.
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Gamble, K.L.
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Journal article
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PLoS ONE, 2014; 9(12, article no. e115760):1-14
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Abstract
Background: There is emerging research to suggest that supine maternal sleep position in late pregnancy may adversely affect fetal wellbeing. However, these studies have all been based on maternal report of sleeping position. Before recommendations to change sleep position can be made it is important to determine the validity of these studies by investigating how accurate pregnant women are in reporting their sleep position. If avoiding the supine sleeping position reduces risk of poor pregnancy outcome, it is also important to know how well women can comply with the instruction to avoid this position and sleep on their left.
Conclusions: On average participant reports of sleep position were relatively accurate but there were large individual differences in reporting accuracy and in objectively-determined time on left side. Night-to-night consistency was substantial.For those who do not ordinarily sleep on that side, asking participants to sleep on their left may result in reduced sleep duration. This is an important consideration during a sleep-critical time such as late pregnancy.
Method: Thirty women in late pregnancy participated in a three-night observational study and were asked to report their sleeping position. This was compared to sleep position as recorded by a night capable video recording. The participants were instructed to settle to sleep on their left side and if they woke overnight to settle back to sleep on their left.
Results: There was a moderate correlation between reported and video determined left-side sleep time (r=0.48), mean difference=3 min (SD=3.5 h). Participants spent an average of 59.60% (SD=16.73%) of time in bed on their left side (ICC across multiple nights =0.67). Those who included left side among their typical sleep positions reported significantly longer sleep during the study (p<0.01).
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Copyright 2014 Warland, Dorrian. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. (https://creativecommons.org/licenses/by/4.0/)