Question

Is sleepy (or its synonyms) a character trait? any help would be appreciated :)

Answer 1

Not really. Anyone can be sleepy at anytime and it's more of a feeling than a permanent trait. It might be better go with something like "lazy", "lethargic" or "bored".

Answer 2

Perhaps say something like lazy or tired? Sleepy is considered a character trait, but it is not very formal.