insomniac

noun

1. a person who suffers from insomnia, the inability, especially when chronic, to obtain sufficient sleep, through difficulty in falling or staying asleep: Her husband, an insomniac, had at last fallen asleep at the computer, head resting on the keyboard.

adjective

2. having insomnia: a nervous, insomniac person.
3. of, relating to, or causing insomnia: long, torturous, insomniac nights.

adjective

1. exhibiting or causing insomnia

noun

2. a person experiencing insomnia

n.

1. One who suffers from insomnia.

adj.

1. Having or causing insomnia.