1. A person or animal that sleeps in a disturbed or agitated manner, frequently moving or waking during sleep
The child was a restless sleeper, tossing and turning all night.
A criança era uma menina que dormia inquieta, virando-se a noite toda.
2. Someone who is anxious or worried and cannot sleep peacefully
He was a restless sleeper due to his concerns about the upcoming exam.
Ele era um rapaz que dormia inquieto por causa de suas preocupações com o exame.