AP PSYCHOLOGY

Detailed explanation-1: -Before entering sleep, you briefly pass through a relaxed and drowsy state. This is marked by which characteristic? When in this stage of sleep, brain waves have a fast frequency and low amplitude and look very similar to beta waves, which occur when you are wide-awake and alert.

Detailed explanation-2: -Non-Rapid Eye Movement Sleep. After one’s eyes close, brainwaves become slower and more regular than when fully alert. They are called alpha waves, look like the teeth of a comb, and signify a relaxed yet still wakeful state, akin to meditation.

Detailed explanation-3: -Theta Brainwaves: Like Delta brainwaves, theta waves occur when you are relaxing or sleeping, and indicate dreaming and focus.

Detailed explanation-4: -Alpha brain waves are the main brain wave pattern that develops when a person becomes drowsy. View Source and transitions from wakefulness to sleep. They continue during the early phase of sleep until they are replaced by slower theta waves.

Detailed explanation-5: -As a person transitions from being awake to falling asleep, alpha waves are replaced by theta waves. Sleep spindles and K-complexes emerge in stage 2 sleep. Stage 3 and stage 4 are described as slow-wave sleep that is marked by a predominance of delta waves.