insomniac

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.

辞典例句

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.

期刊摘选