Obstructive sleep apnea is often associated with microarousals and a stimulation of the sympathetic nervous system. The knowledge of this autonomic activation may help understanding the increase of cardiac risk observed in elderly. The aim of the study is to evaluate the relationship between obstructive sleep apnea severity, age, gender and heart rate response associated with obstructive sleep apnea. Drug-free patients diagnosed with obstructive sleep apneas were included. Clinical data and 24-h polysomnography recordings were analyzed.

Inclusion Criteria:

• Restless legs syndrome patients
• Hospital routine for sleep disorders breathing diagnosis
• Apnea index > 0

Exclusion Criteria:

• Narcolepsy-cataplexy
• Sleep irregularities and sleep deprivation symptoms
• Lack of neurological or psychiatric diseases
• Periodic leg movements
• Central sleep apnea, treatment
• Cerebral lesion
• Medical illness
• Medication or drinks affecting sleep and wake state.

Patients with obstructive sleep apneas with a diagnosis from January 1st 2012 to September 1st 2016.