Patients with NC had significant shortened sleep latency and abnormal features of REM sleep, the MSLT and PSG were important reference to diagnoses and differential diagnoses of narcolepsy and lethargy.

• NC患者具有明显的睡眠潜伏期缩短和反常的REM睡眠特征,MSLT、PSG对NC和IH的诊断和鉴别诊断具有重要参考价值。