Patient education
Behavioral modification
Losing weight if overweight
Exercise
Changing sleep position if positional
Abstaining from alcohol or certain sedative medications
Positive airway pressure during sleep
Oral appliance is reasonable second line for mild-moderate<unk> 
Surgical therapy
Surgical resection of obstructing lesion
Hypoglossal nerve stimulation
Losing weight if overweight
Exercise
Changing sleep position if positional
Abstaining from alcohol or certain sedative medications
Surgical resection of obstructing lesion
Hypoglossal nerve stimulation
Obstructive sleep apnea
Excessive daytime sleepiness
Sick sinus syndrome
Insufficient sleep - shift work, underlying comorbidity, medication affects
Pulmonary hypertension 
Sleep disorders - circadian rhythm sleep-wake disorder, narcolepsy
Pulmonary hypertension
Sleep related movement disorder - restless legs syndrome, periodic limb movement disorder