Sleep Stages and Functions

The video explores the concept of sleep, its stages, and the brain's activity during sleep. It discusses why we sleep, the purpose of dreams, and various theories related to sleep, including recuperation and adaptation. The video also covers the physiological functions of sleep, such as memory consolidation, and the effects of sleep deprivation on the body and mind.

What is the average duration of time the conscious mind shuts down during sleep?

• Two to three hours

• Nine to ten hours

• Four to five hours

• Seven to eight hours

Which stage of sleep is characterized by theta waves?

• REM

• N1

• N2

• N3

What are K complexes and sleep spindles associated with?

• N1 stage

• N2 stage

• REM stage

• N3 stage

During which stage of sleep do rapid eye movements occur?

• REM

• N3

• N2

• N1

Which theory suggests that dreams are random signals processed by the cortex?

• Adaptation theory

• Recuperation theory

• Activation-synthesis theory

• Freudian theory

What is the main focus of recuperation theories regarding sleep?

• Enhancing memory

• Achieving homeostasis

• Avoiding predators

• Conserving energy

What is the term for the natural cycle of waking and sleeping that aligns with day and night?

• Circadian rhythm

• Sleep cycle

• REM cycle

• Biological clock

Which part of the brain is involved in regulating circadian rhythms?

• Amygdala

• Hippocampus

• Suprachiasmatic nucleus

• Cerebellum

What is one of the key functions of sleep related to memory?

• Memory fragmentation

• Memory deletion

• Memory distortion

• Memory consolidation

What is a common effect of significant sleep deprivation?

• Increased energy

• Improved mood

• Enhanced cognitive function

• Reduced immune function