"...obstructive sleep apnea is a breathing disorder characterized by recurrent episodes of Airway obstruction during sleep leading to periods with breathing stops known as apnea moving from wakefulness to sleep causes relaxation of muscle tone including the muscles of the upper Airway this allows the soft palate and the tongue to relax and to create an obstruction that reduces the patency of the respiratory tract rapid eye movement or REM sleep, in particular, is known to feature this reduction in muscle tone but it can happen throughout the Sleep Cycle there is snoring when some still enter but as the obstruction progresses the airflow can be severely reduced causing apnea the reduction in the ventilation of the lungs causes a reduction in blood oxygen levels and as a result there is an interruption in sleep known as neurological arousal with a partially awakens in order to restore muscle tone and therefore oxygenation but this isn't necessarily perceived by the person partial collapses with reduced oxygen or arousals a termed hypo apneas while apnea is defined as over a 90% airflow obstruction lasting 10 longer a cycle is there for generated alternating between periods of deeper sleep and higher wakefulness with a typical sleep cycle is which ultimately disrupts the quality of sleep and can cause sleep deprivation risk factors are thought to be obesity as it increases the amount of soft tissue around the airway..."

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