Not typically an ED diagnosis
Evaluate for alternative, emergent etiology of symptoms
Not a clinical diagnosis and objective testing must be performed for diagnosis
Consider diagnostic testing with patients with excessive day time sleepiness (EDS) on most days and two of the following clinical features: habitual loud snoring, witnessed<unk>  or gasping or choking during sleep, and diagnosed systemic hypertension.
Evaluation tool parameters: No evaluation tools have been shown to be superior to history and physical examination and their poor accuracy make them imperfect diagnostic tools, but are often used in preoperative evaluation to assess risk of undiagnosed<unk> 
STOP-Bang questionnaire
Epworth Sleepiness Scale
Polysomnography: gold standard diagnostic test for<unk> . Preferred in-lab testing for those with suspected concomitant respiratory disorder (e.g. COPD), concomitant sleep disorder(e.g. narcolepsy), mild disease, negative or inconclusive home testing
Home sleep<unk>  testing: Good for patients with high pretest probability for moderate to severe uncomplicated<unk> .
STOP-Bang questionnaire
Epworth Sleepiness Scale
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