The term 'Restless Sleeper' can be summarized as someone who has difficulty sleeping due to restlessness. This could be caused by a variety of factors, such as stress, anxiety, or physical discomfort. The crossword solution for this term is 'TOSSER, ' which is a slang term for someone who tosses and turns in their sleep. This term implies that the person is unable to stay still while sleeping, which can lead to a restless night.