Adam, a sleep researcher, noticed that his sleeping patient had a high level of neurological arousal. The patient is most likely in _______ sleep.

A) stage 1
B) stage 2
C) stage 3
D) rapid eye movement

Stage 1 Sleep

The initial phase of sleep that is light and easily disrupted, serving as a transition from wakefulness to deeper sleep stages.

Rapid Eye Movement

A phase of sleep characterized by the random movement of the eyes, dreaming, and increased brain activity.

Stage 2 Sleep

A stage of sleep characterized by the presence of sleep spindles and K complexes, representing a deeper sleep than stage 1 and accounting for approximately 50% of sleep time in adults.