1. A person who wakes up easily or frequently during sleep due to sensitivity to noise, movement, or other disturbances
She is a light sleeper and wakes up at the slightest sound.
Ela é uma dorminhoca leve e acorda com o menor barulho.
2. Someone whose sleep is shallow and easily interrupted
As a light sleeper, he needs complete silence to rest properly.
Como dorminhoco leve, ele precisa de silêncio total para descansar adequadamente.