LI.1.22 & LI.1.24: Sleep-Wake Cycle (REM & N-REM)

What is the average duration of one cycle of NREM and REM sleep in adults?

During which stage of NREM sleep are hallucinatory images, such as flashes of light and vivid images, most likely to occur?

• Stage 1
• Stage 2
• Stage 3
• Stage 4

Scenario: Jamie often wakes up feeling disoriented and unable to move for a few seconds. This happens during the early morning hours. Which stage of sleep is Jamie most likely experiencing this phenomenon?

• REM sleep
• Stage 3 NREM sleep
• Stage 4 NREM sleep
• Stage 2 NREM sleep

Scenario: Alex, a teenager, notices that they have a delayed sleep phase compared to their younger sibling. What theory explains this change?

• Restoration theory
• Evolutionary theory
• Circadian rhythm theory
• Sleep-wake shift theory

What are the primary differences between NREM and REM sleep?

• NREM sleep involves rapid eye movement, while REM does not
• REM sleep is a deeper sleep stage compared to NREM
• Dreaming occurs only during REM sleep
• NREM sleep is associated with physiological changes like increased heart rate

Which hormone is primarily responsible for regulating the sleep-wake cycle?

• Cortisol
• Adrenaline
• Melatonin
• Serotonin

What is the main characteristic of Stage 3 NREM sleep?

• Light sleep
• Dreaming
• Muscle relaxation
• Rapid eye movement

During which stage of sleep does dreaming primarily occur?

• Stage 1 NREM
• Stage 3 NREM
• REM sleep
• Stage 4 NREM

What is the term used to describe the 24-hour biological cycle in humans?

• Circadian rhythm
• Ultradian rhythm
• Infradian rhythm
• Homeostatic rhythm

Which stage of NREM sleep is known as 'deep sleep'?

• Stage 1
• Stage 2
• Stage 3
• Stage 4