Gina Johnson
Many people believe that snoring is a sign of deep sleep. While snoring can occur during deep sleep, it does not necessarily indicate that a person is getting restorative sleep. In fact, individuals who snore loudly may be at risk of sleep disorders like obstructive sleep apnea (OSA), which can severely disrupt sleep quality. Obstructive sleep apnea is a condition characterised by repeated interruptions in breathing during sleep due to a collapse of the airway.
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What You'll Learn
Snoring is more prominent during deep sleep
The common belief that snoring means deep sleep is often surrounded by misconceptions. While snoring can occur during deep sleep, it does not necessarily indicate that a person is getting restorative sleep. In fact, individuals who snore loudly may be at risk of sleep disorders like obstructive sleep apnea (OSA), which can severely disrupt sleep quality.
Obstructive sleep apnea is a condition characterised by repeated interruptions in breathing during sleep due to a collapse of the airway. During deep sleep, also known as NREM stage 3 sleep or delta sleep, the muscles are completely relaxed, breathing slows down, and blood pressure drops. As a result, it's hard to wake someone up from this stage, which explains why a typical snorer won't budge when you try to wake them.
Snoring is caused by obstructed or reduced airflow through the nose, mouth, pharynx, or throat. In the nose, a deviated septum or unusually small nostrils may cause snoring, resulting in high-pitched whistling or brief grunting sounds. Allergies and colds that cause sinus congestion can also lead to nose-based snoring. Mouth-based snoring occurs when the soft palate, which moves up and down during breathing and speaking, drops and obstructs airflow.
During deep sleep, the soft palate may drop, resulting in mouth-based snoring. The tongue, a large muscle that extends into the oropharynx (the back of the mouth and throat), can also cause snoring, particularly when sleeping on the back. When the tongue relaxes and collapses into the throat, it obstructs breathing and results in tongue-based snoring.
While snoring can occur during deep sleep, it may also indicate airway obstruction, particularly in cases of sleep apnea. If you snore loudly and experience excessive daytime sleepiness, it may be wise to consult a healthcare professional for evaluation.
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Snoring can disrupt deep sleep
While snoring is more common during deep sleep, it can also indicate a partial blockage in the respiratory pathways, which can happen in any sleep stage but is more common in non-REM stages, particularly stages 3 and 4, known as deep sleep. During these stages, the muscles of the throat relax, which can lead to partial airway blockage and the characteristic sounds of snoring.
Snoring is caused by obstructed or reduced airflow through passageways and may occur in four places: the nose, the mouth, the pharynx, and the throat. In the nose, a deviated septum or unusually small nostrils may cause snoring, and it will sound like high-pitched whistling or brief grunts. Allergies and colds that cause sinus congestion can also cause nose-based snoring. Snoring may also be mouth-based and is differentiated from nose snoring as it only occurs when the mouth is open. In the mouth, the posterior (toward the back) roof, called the soft palate, moves up and down as we breathe and speak. This structure is found between the back of the nasal cavity and oral cavity and can obstruct airflow through these areas to the lungs. When the body relaxes in a deep sleep, this soft palate may drop and result in mouth-based snoring.
People are more likely to snore when sleeping on their backs because gravity can cause the tongue and soft palate to collapse to the back of the throat. Obesity can also lead to increased tissue around the neck, which narrows the airway and increases the likelihood of snoring. Alcohol consumption relaxes the muscles in the throat, which can exacerbate snoring. Nasal congestion caused by allergies or colds can lead to snoring as airflow is obstructed. These factors contribute to the sound of snoring, but they do not necessarily correlate with the depth of sleep. Understanding these causes is crucial for finding effective solutions to reduce snoring and improve sleep quality.
While most cases of snoring are temporary and relatively benign, some could indicate obstructive sleep apnea (OSA). OSA is a sleep disorder in which upper airway obstruction is so severe that it leads to 10- to 30-second pauses in breathing, sometimes up to 400 times every night! Without treatment, OSA tends to worsen and lead to a host of dangerous health problems, including cardiovascular disease, high blood pressure, and daytime fatigue.
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Snoring may indicate a health problem
While snoring is commonly associated with deep sleep, it may also indicate potential health problems.
During deep sleep, also known as NREM stage 3 sleep or delta sleep, the muscles completely relax, breathing slows down, and blood pressure drops. As a result, it is difficult to wake someone up from this stage, which is why deep sleepers who snore are challenging to rouse.
However, snoring is caused by obstructed or reduced airflow through the nose, mouth, pharynx, or throat, leading to turbulent airflow and the surrounding tissues vibrating. This obstruction can occur for various reasons, such as congestion from allergies, viral infections, or acid reflux, causing the tissues in the throat to swell. Additionally, excess weight can lead to increased tissue around the neck, narrowing the airway and increasing the likelihood of snoring. Alcohol consumption also relaxes the throat muscles, exacerbating snoring.
While most cases of snoring are temporary and benign, chronic and loud snoring may indicate obstructive sleep apnea (OSA). OSA is a sleep disorder characterised by repeated interruptions in breathing due to a collapse of the airway. Snoring is a prominent symptom of OSA, and these breathing interruptions can lead to brief awakenings, preventing deep sleep. OSA is associated with health risks, including cardiovascular disease, high blood pressure, and daytime fatigue.
Therefore, while snoring may occur during deep sleep, it can also signify underlying health issues, particularly related to breathing and sleep disorders. If you or a loved one snore loudly and experience excessive daytime sleepiness, it is recommended to consult a healthcare professional for evaluation and guidance.
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Sleep position can cause snoring
While snoring can occur during deep sleep, it can also be caused by sleep position. Sleeping on your back can cause snoring because gravity can cause the tongue and soft palate to collapse to the back of the throat. This can be prevented by raising the head of the bed at night, using an adjustable bed, or a sleeping wedge pillow. Sleeping in an inclined position has been shown to reduce snoring duration by 7% compared to a flat position.
Additionally, obesity can lead to increased tissue around the neck, narrowing the airway and increasing the likelihood of snoring. Alcohol consumption can also relax the muscles in the throat, exacerbating snoring. Nasal congestion due to allergies or colds can also obstruct airflow and lead to snoring. These factors do not necessarily correlate with the depth of sleep, and snoring can occur during various stages of sleep.
While snoring is common and usually benign, it can sometimes indicate a more serious condition such as obstructive sleep apnea (OSA). OSA is characterised by repeated interruptions in breathing during sleep due to airway collapse, and snoring is often a prominent symptom. If snoring is accompanied by other symptoms such as fatigue, irritability, or difficulty focusing, it may be advisable to consult a healthcare professional.
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Alcohol consumption and snoring
While snoring can occur during deep sleep, it does not necessarily indicate that a person is getting restorative sleep. Snoring is caused by an obstruction in the upper airways, which leads to turbulent airflow and the hoarse or rattling noise we associate with snoring. Obstruction of the upper airways can be caused by congestion from allergies or viral infections, acid reflux, excess weight, and the natural weakening of upper airway muscles due to age.
Alcohol consumption is a common behavioural cause of snoring. Alcohol relaxes the muscles in the throat, which can exacerbate snoring. It also suppresses the central respiratory drive and muscle tone and causes changes in blood flow that negatively impact respiration. Additionally, alcohol reduces REM sleep and increases wakefulness in the latter part of the night, leading to more nighttime awakenings and poorer sleep quality.
Several studies have found that alcohol consumption is associated with worsening snoring severity and lower oxygen saturation in individuals with obstructive sleep apnea (OSA). A 2020 study noted that alcohol consumption close to bedtime can contribute to lower oxygen saturation in individuals at risk of snoring or OSA. Another study found that alcohol consumption was associated with a higher AHI rate, indicating more frequent interruptions in breathing per hour. These interruptions can lead to brief awakenings, preventing individuals from entering and maintaining deep sleep.
The amount of alcohol consumed and the proximity to bedtime can influence the likelihood of snoring and OSA events. It is recommended that individuals with sleep apnea abstain from alcohol or consume their last drink at least two hours before sleeping to allow time for the alcohol to dissipate.
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Frequently asked questions
It's a common misconception that snoring means deep sleep. While snoring can occur during deep sleep, it may also indicate airway obstruction, particularly in cases of sleep apnea.
Obstructive sleep apnea (OSA) is a sleep disorder in which the upper airway obstruction is so severe that it leads to 10- to 30-second pauses in breathing, sometimes up to 400 times every night.
Snoring is caused by obstructed or reduced airflow through the nose, mouth, pharynx, or throat. This can be due to various factors such as nasal congestion, the shape of the mouth and throat, obesity, alcohol consumption, and aging.
Yes, snoring can significantly disrupt sleep, not just for the snorer but also for their partner. It can prevent individuals from fully benefiting from the restorative effects of deep sleep, impacting overall health and functioning.
To reduce snoring, it is recommended to change sleep positions, maintain a healthy weight, avoid alcohol before bed, and treat nasal congestion. Consulting a healthcare professional is advised if loud snoring and excessive daytime sleepiness are experienced.
