* = 6 patients received a diagnosis of circadian rhythm disorders, and all met the criteria for delayed sleep phase syndrome. † = 3 of 4 patients with RLS had a previous diagnosis of PLMD. ‡ = 4 patients received a diagnosis of idiopathic hypersomnia based on the clinical presentation and PSG, 6 received a diagnosis of narcolepsy and of those, 1 was lost to follow-up. § = subjects who presented with either excessive daytime sleepiness or restless sleeper but had normal PSG and no identified clinical sleep disorders. ‖ = subjects who did not complete PSG and were lost to follow-up; hence, they did not reach a final sleep disorder diagnosis. OSA = obstructive sleep apnea, PLMD = periodic limb movement disorder, PSG = polysomnography, RLS = restless legs syndrome.