Final answer:
Consciousness varies from complete awareness to deep sleep, and can be altered by intoxication, anesthesia or meditative practices. General anesthesia results in unconsciousness with various effects, and even when awake, biological rhythms can trigger states like daydreaming.
Step-by-step explanation:
We experience different states of consciousness, ranging from full awareness to a deep sleep. Consciousness can also be altered in various ways, including intoxication, anesthesia, and meditative states. During these states, individuals may not be fully aware of their surroundings or may experience different perceptions.
For instance, under general anesthesia, patients undergo a state of unconsciousness, characterized by immobility, analgesia, amnesia, and reduced responsiveness to painful stimuli. Biological rhythms can also influence our states of consciousness and make us experience moments where we are not completely aware even when awake. An example of this is daydreaming while performing an activity like driving without actively thinking about it.