AP Psych 1.5 - Sleep

2025 Curriculum. Different stages of sleep and key terms.

Activation Synthesis

Theory that dreams result from the brain's attempt to make sense of random neural activity during sleep.

Circadian Rhythm

The natural, internal process that regulates the sleep-wake cycle, repeating roughly every 24 hours.

Hypnagogic Sensations

Experiences that occur just before falling asleep, often including vivid imagery or sensations.

Insomnia

A sleep disorder characterized by difficulty falling asleep, remaining asleep, or waking up too early, resulting in daytime fatigue or impairment.

Memory Consolidation

The process by which short-term memories are transformed into long-term memories during sleep, particularly during rapid eye movement (REM) sleep.

Narcolepsy

A chronic sleep disorder characterized by overwhelming daytime drowsiness and sudden attacks of sleep, which can occur at any time.

NREM

Non-Rapid Eye Movement sleep, a crucial phase of the sleep cycle that includes stages of light and deep sleep.

REM Rebound

The phenomenon where individuals experience increased duration and intensity of REM sleep following a period of sleep deprivation.

REM Sleep

A stage of sleep characterized by rapid eye movement, increased brain activity, and vivid dreams, playing a vital role in memory consolidation and emotional processing.

REM Sleep Behavior Disorder

A condition in which individuals act out their dreams during REM sleep, often resulting in physical movements or vocalizations.

Restoration

A sleep stage where the body repairs and restores itself physically and mentally, crucial for overall health and well-being.

Sleep Apnea

A sleep disorder characterized by repeated interruptions in breathing during sleep, leading to disrupted sleep patterns and daytime fatigue.

Somnambu

lism, commonly known as sleepwalking, involves getting up and walking around while still asleep.

Awake

Stage 1

Stage 2

Stage 3

REM