54.下列何者屬於睡眠障礙?①失眠(insomnia) ②阻塞性睡眠呼吸中止症(obstructive sleep apnea) ③不寧腿症候群(restless legs syndrome) ④猝睡症(narcolepsy)(A)僅①③(B)僅①②④(C)僅③④(D)①②③④