Understanding the Sleep Cycle

What is the primary misconception about the brain's activity during sleep?

• The brain only processes dreams.

• The brain is more active than when awake.

• The brain is completely inactive.

• The brain stops producing electrical signals.

What device do researchers use to study brain activity during sleep?

• PET Scan

• EEG

• CT Scan

• MRI

Which type of brain waves are associated with being awake and alert?

• Alpha waves

• Delta waves

• Theta waves

• Beta waves

What are the characteristics of Stage 1 sleep?

• Delta waves and deep sleep

• Theta waves and hypnogogic sensations

• Rapid eye movement and vivid dreams

• High frequency, high amplitude waves

What unique features are observed in Stage 2 sleep?

• Hypnogogic sensations and theta waves

• Sleep spindles and K complexes

• Delta waves and muscle atonia

• Beta waves and alertness

What is the primary function of Stage 3 sleep?

• Memory consolidation

• Blocking external stimuli

• Physical restoration

• Dreaming

Which type of brain waves are dominant during deep sleep?

• Delta waves

• Theta waves

• Beta waves

• Alpha waves

What is a key characteristic of REM sleep?

• Theta waves and sleep spindles

• Muscle atonia and vivid dreams

• Delta waves and physical restoration

• High amplitude, low frequency waves

How often does the sleep cycle repeat throughout the night?

• Every 30 minutes

• Every 60 minutes

• Every 90 minutes

• Every 120 minutes

What happens to the amount of REM sleep as the night progresses?

• It decreases

• It remains constant

• It stops completely

• It increases