insomniac的复数形式怎么拼写？

n.失眠症患者...

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....

insomniac的音标：insomniac的英式发音音标为：[ɪn'sɒmniæk]insomniac的美式发音音标为：[ɪn'sɑmniæk]...