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There may be a choking or snorting sound as breathing resumes. Sleep apnea is a potentially serious sleep disorder in which breathing repeatedly stops and starts. What Happens Inside Of You When You Sleep With Images Rem These can relax the muscles in the back of the throat causing it to collapse during sleep. Level of sleep apnea . At sea level a normal blood oxygen level saturation is usually 96 97. If you snore loudly and feel tired even after a full night s sleep you might have sleep apnea. In the most common form this follows loud snoring. Patients with breathing problems during sleep sleep apnea copd often have low oxygen levels in their blood. Obstructive sleep apnea osa is the most common type of sleep apnea and is characterized by repeated episodes of complete or partial obstructions of the upper airway during sleep despite the effort to breathe and is usually associated with a reduction in blood oxygen saturation in the obstructive sleep apnea hypopnea syndrome t...