Negative feedback works to bring the body back to its O set point
O fluctuating state
O control center.
O effector.

When a deviation occurs away from the set point in a negative feedback loop, sensory receptors detect the change and effectors are stimulated to bring the condition back to that determined by the set point. ... A feedback loop helps maintain homeostasis of the internal environment and includes three parts:

you may having too much sleep.. a good night sleep consists of about 7 hours. more than that could be the reason you're still tired throughout the day.