Sleeping on the back can increase the risk of snoring and obstructive sleep apnea by allowing throat tissues to collapse under gravity, according to cardiologist Dr. Marc-Antoine Gariel. This airway obstruction can lead to fragmented sleep and increased cardiovascular strain over time.
Why sleeping on the back obstructs breathing
Gravity is the primary mechanism behind respiratory issues in the supine position. According to Dr. Marc-Antoine Gariel, lying flat on the back causes the tongue and the soft tissues of the throat to slide backward. This movement narrows or completely blocks the upper airway.
For individuals with a predisposition to obstructive sleep apnea (OSA), this blockage results in repeated pauses in breathing throughout the night. These episodes force the brain to momentarily wake the body to resume breathing, which disrupts the sleep cycle and prevents the body from reaching deep, restorative stages of rest.
How sleep apnea impacts heart health
The consequences of airway obstruction extend beyond daytime fatigue. Dr. Gariel notes that the repeated drops in blood oxygen levels associated with sleep apnea place significant stress on the cardiovascular system.
When oxygen levels fall, the heart must work harder to compensate. According to the cardiologist, this chronic strain can contribute to several serious health conditions, including:
- Hypertension (high blood pressure)
- Heart failure
- Increased risk of cardiovascular events
The resulting fragmentation of sleep means the heart and vascular system do not receive the typical nocturnal dip in blood pressure, maintaining a state of high stress for several hours each night.
Which positions promote better respiration
To mitigate the risks of airway collapse, Dr. Gariel suggests avoiding the back in favor of lateral sleeping (sleeping on the side). This position keeps the airway open by preventing the tongue from falling toward the back of the throat.
The side position is generally the most recommended to avoid these respiratory complications and improve overall sleep quality.
Dr. Marc-Antoine Gariel, cardiologist
While side sleeping is the primary recommendation for respiratory health, the choice of side can also impact other bodily functions. Medical literature often notes that sleeping on the left side can assist with digestion and reduce acid reflux, though the primary goal for apnea patients remains the avoidance of the supine position.
