Science

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Insomnia is the most common sleep disorder in the United States, affecting roughly one in three Americans, according to the University of Missouri.

This is a significant public health concern as sleep is essential for our mental and physical wellbeing, and not getting enough has been shown to contribute to heart disease, obesity, neurodegenerative disorders and depression.

Numerous studies have suggested that regular physical activity promotes better quality sleep and may improve symptoms of chronic insomnia, but exactly how much exercise is required has not been totally understood.

In the latest study, published in the journal BMJ Open, researchers from across Europe, led by Reykjavik University in Iceland, set about answering this question by analyzing data from 4,399 participants from the European Community Respiratory Health Survey.

A further 37 percent remained inactive, with less than one hour of exercise per week for the entire study period.

"Our results are in line with previous studies that have shown the beneficial effect of [physical activity] on symptoms of insomnia, but the current study additionally shows the importance of consistency in exercising over time, because the association was lost for initially active subjects who became inactive," the authors write.

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