The main types of sleep apnea are:
Central sleep apnea
Obstructive sleep apnea
Complex sleep apnea syndrome

The major symptoms of sleep apnea are
Irritability
Loud snoring
Insomnia (inability to sleep)
Hypersomnia (excessive daytime sleepiness)
Morning headache
Awakening with dry mouth

Physical, emotional and mental functioning may be associated with stress. Stress can cause sleepless nights and other sleep disorders, such as insomnia, whereas loud snoring or sleep apnea is caused by an obstructive airway in which breathing gets interrupted.

The risk factors for central sleep apnea are
Heart disorder
Stroke
Use of narcotic pain medication
The risk factors for obstructive sleep apnea are
Overweight
Family history
Smoking
Alcohol use
Tranquilizers or sedatives
Nasal congestion

No, sleep apnea treatment does not involve medications. Opioid medications, such as methadone, increase the risk of central sleep apnea. Certain medications and general anaesthesia also increase the risk of obstructive sleep apnea.