Final answer:
The majority of dreams occur during REM sleep, characterized by eye movements, paralyzed voluntary muscles, and brain activity similar to an awake state.
Step-by-step explanation:
The majority of our dreams occur during REM sleep, which is option (A). REM, or Rapid Eye Movement sleep, is marked by rapid movements of the eyes, paralysis of voluntary muscles, and dreaming. It is characterized by brain waves that are very similar to those observed when a person is awake. Notably, sleep spindles and K-complexes, which are often associated with learning and memory, appear during stage 2 NREM sleep. However, the most vivid dreaming and higher brain activity that are similar to a wakeful state happen specifically during REM sleep, making it the phase where the majority of dreams occur.
The majority of our dreams occur in REM sleep. REM sleep is marked by rapid movements of the eyes and brain waves during this stage are very similar to those observed when a person is awake. It is also during REM sleep that dreaming occurs.