1. A person, typically female, who sleeps poorly or has difficulty sleeping through the night
She is a bad sleeper and wakes up several times during the night.
Ela é uma má dormidora e acorda várias vezes durante a noite.
2. Someone who is easily awakened or restless while sleeping
As a light sleeper, any noise disturbs her rest.
Como uma má dormidora, qualquer barulho perturba seu descanso.