Snoring and Daytime Sleepiness

Excessive daytime sleepiness is related to habitual snoring in women.


  1. Snoring is an independent cause of excessive daytime sleepiness.

Malin Svensson, MD et al. Daytime sleepiness relates to snoring independent of the apnea-hypopnea index in women from the general population

In: Chest (2008 Aug) doi:10.1378/chest.08‐0847

Objectives: The aim was to investigate the significance of snoring and sleep apnea on daytime symptoms in a population‐based sample of women.

Method: From the general population, 400 women, aged 20‐70 years, were randomly selected, with over sampling of habitually snoring women. They were investigated with a full‐night polysomnography and a questionnaire. The apnea‐hypopnea index (AHI) was calculated, and women who acknowledged snoring loudly and disturbingly often or very often were considered habitual snorers.

Results: Habitual snoring was independently related to excessive daytime sleepiness, OR= 2.28 (1.31‐3.99), to falling asleep involuntarily during the day, OR= 2.11 (1.06‐4.21), to waking up unrefreshed, OR= 2.14 (1.30‐3.52), to daytime fatigue, OR= 2.77 (1.54‐4.99) and to a dry mouth on awakening, OR= 2.00 (1.22‐3.27) after adjustment for of AHI, age, body mass index (BMI), smoking, total sleep time, % slow wave sleep and % REM sleep. Apnea‐hypopnea index ≥15 was only related to a dry mouth on awakening after adjustment for snoring, age, BMI, smoking, total sleep time, % slow wave sleep and % REM sleep, OR= 2.24 (1.14‐4.40). An AHI of 5‐15 was not related to any daytime symptom.

Conclusions: Excessive daytime sleepiness and daytime fatigue are related to habitual snoring independent of the apnea‐hypopnea frequency, age, obesity, smoking and sleep parameters in a population‐based sample of women, but not to the apnea‐hypopnea index. This indicates that snoring is an independent cause of excess daytime sleepiness and not merely a proxy for sleep apnea.

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