CBT-I Sleep Physiology & Disorders

Question 1

What are the two main types of sleep?

Accepted Answer

REM and non-REM sleep

Answer

Sleep is broadly categorized into two main types: Rapid Eye Movement (REM) sleep and non-Rapid Eye Movement (non-REM) sleep. Non-REM sleep is further divided into three stages, progressing from light sleep to deep sleep, while REM sleep is characterized by vivid dreaming and increased brain activity. These two types cycle throughout the night, each playing distinct roles in physical and mental restoration.

Question 2

Which stage of sleep is most associated with dreaming?

Accepted Answer

REM sleep

Answer

REM (Rapid Eye Movement) sleep is the stage most strongly associated with vivid dreaming. During REM sleep, brain activity significantly increases, mimicking wakefulness, and the eyes move rapidly beneath closed eyelids. This stage is crucial for cognitive functions like memory consolidation and emotional processing, often accompanied by intense dream experiences.

Question 3

What is insomnia characterized by?

Accepted Answer

Difficulty sleeping and staying asleep

Answer

Insomnia is a common sleep disorder primarily characterized by persistent difficulty falling asleep, staying asleep, or waking up too early and being unable to return to sleep. This leads to insufficient or non-restorative sleep, resulting in daytime fatigue, impaired concentration, and other functional difficulties. It's not just about lack of sleep, but the struggle to achieve it.

Question 4

What hormone is primarily responsible for regulating sleep-wake cycles?

Accepted Answer

Melatonin

Answer

Melatonin is a hormone produced by the pineal gland in the brain, primarily responsible for regulating the body's sleep-wake cycles, also known as the circadian rhythm. Its production increases in the evening as darkness falls, signaling to the body that it's time to sleep, and decreases in the morning with light exposure. This helps synchronize our internal clock with the external day-night cycle.

Question 5

Which sleep disorder involves breathing interruptions during sleep?

Accepted Answer

Sleep apnea

Answer

Sleep apnea is a serious sleep disorder characterized by repeated interruptions in breathing during sleep. These pauses can last from a few seconds to minutes and can occur multiple times an hour, leading to fragmented sleep and reduced oxygen levels. It often results in loud snoring and excessive daytime sleepiness, and can have significant health consequences if left untreated.

(CBT-I) CBT Insomnia Certification Practice Test

(CBT-I) CBT Insomnia Certification Practice Test

CBT-I Sleep Physiology & Disorders