insomnia (n.)
inability to sleep
Examples
- He suffers from insomnia.
Key rules
- Insomnia is inability to sleep
- Suffer from insomnia, have insomnia
- Insomnia is uncountable
Common mistakes
- He suffers insomnia → He suffers from insomnia
Use cases
- Sleep problems
- Health discussions
- Describing stress
💡 Tip: Insomniac is a person who suffers from insomnia.