Definition: The word "insomniac" can be used as both a noun and an adjective. As a noun, it refers to a person who has difficulty sleeping or cannot sleep at all. As an adjective, it describes something related to sleeplessness.
When discussing insomnia in a more complex way, you might encounter phrases like "chronic insomniac" (someone who has insomnia for a long time) or "acute insomnia" (short-term difficulty sleeping).
While "insomniac" primarily refers to sleeplessness, in a broader context, it can also relate to someone who is very active or engaged in late-night activities (though not a formal definition).
An "insomniac" is someone who has trouble sleeping, and this word can be used in different forms and contexts.