insomniac

英[ɪn'sɒmnɪæk] 美

She's an insomniac; she only sleeps for two or three hours a night.: 她患失眠症, 每晚只睡两三个小时.

The insomniac is habitually afflicted with wakefulness at times when he wishes to sleep.: 失眠症患者,这种病人在他想睡觉时经常特别清醒.