Final answer:
Sleep is a state marked by low physical activity and reduced sensory awareness. It is a distinct state from wakefulness and has important effects on our overall well-being.
Step-by-step explanation:
Sleep is a state marked by relatively low levels of physical activity and reduced sensory awareness that is distinct from periods of rest that occur during wakefulness. It is a state of consciousness that is different from being awake, and it is characterized by certain patterns of brain activity. Sleep is an important process for our overall well-being and plays a role in learning, memory, and physical growth.