1. to spend nights awake; to lose sleep; to have insomnia or be unable to sleep due to worry, stress, or other reasons
I pass sleepless nights thinking about the project deadline.
Passo noites em claro pensando no prazo do projeto.
2. to stay awake through the night, often due to concern or preoccupation
She passes sleepless nights worried about her son's health.
Ela passa noites em claro preocupada com a saúde do filho.