Final answer:
Being conscious refers to the condition of being awake and alert to one's surroundings with high sensory awareness and thought. It is influenced by our circadian rhythms and can be disrupted by various factors, emphasizing the importance of regular sleep patterns. The correct option is D.
Step-by-step explanation:
The condition of being awake and alert to one's surroundings is called being conscious. This state is characterized by high levels of sensory awareness, thought, and behavior. When we are conscious, we are aware of internal stimuli such as pain, hunger, and our own thoughts and emotions, as well as external stimuli like the light from the sun and the voices of people around us.
Our states of consciousness can vary throughout the day due to biological rhythms, particularly circadian rhythms. Disruptions in these rhythms can lead to issues like insomnia and decreased alertness. To maintain a healthy state of consciousness, it's important to keep a regular sleep schedule and manage any sleep disorders.