On your back: Ideal for spinal alignment, but problematic in cases of snoring or apnea. This position reduces blood oxygenation and impairs the quality of deep sleep.
Lying face down: The worst option. It causes cervical torsion, compresses digestive organs, and impedes breathing—a winning combination for muscle pain and difficult waking.
Right side: Less harmful than the prone position, but likely to aggravate gastric reflux and overload liver function.
The crucial importance of age:

For infants, the supine position remains the official recommendation for preventing SIDS . For mature adults, the situation changes: after the age of 60, the risk of sleep apnea increases significantly – the back then becomes a position to avoid !
Words from experts…from their own experience:
Sophie, 36, suffered from postpartum acid reflux for months. Medication provided only temporary relief. Simply changing her sleeping position radically improved her nighttime comfort.
Marc, 59, lived with chronic fatigue until he was diagnosed with severe sleep apnea. Adopting a suitable pillow and changing his sleeping position reduced his episodes of respiratory arrest by more than two-thirds.
5 preconceived ideas that absolutely must be deconstructed:
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