Exploring Sleep Stages and Circadian Rhythms

What happens in the brain during sleep?

• The brain is completely inactive.

• The brain goes through multiple active cycles.

• The brain processes only memories.

• The brain only rests.

How many main stages of sleep are there?

• Three

• Five

• Two

• Four

What are hypnagogic hallucinations?

• Dreams during deep sleep

• Sensations experienced in the N1 stage

• Sounds during REM sleep

• Visuals during N3 sleep

What phenomenon can occur if you've been doing repetitive activities before bed?

• Decreased sleep quality

• Increased REM sleep

• Longer N3 sleep stage

• Hypnagogic hallucinations

What is the Tretis effect related to?

• Eating before sleep

• Playing Tetris before bed

• Exercising before sleep

• Watching TV before bed

What role do sleep spindles play in sleep?

• Inducing deep sleep

• Triggering sleep paralysis

• Causing dreams

• Maintaining tranquil state

What triggers K-complexes during sleep?

• Loud noises

• Gentle touch

• Bright lights

• Sudden movements

What characterizes the N3 sleep stage?

• Rapid eye movement

• Slow delta waves

• Muscle paralysis

• Theta waves production

Why is muscle paralysis important during REM sleep?

• To prevent acting out dreams

• To enhance dream quality

• To increase brain activity

• To reduce heart rate

How does the duration of sleep stages change throughout the night?

• REM sleep decreases

• N3 sleep increases

• More REM sleep towards morning

• N1 sleep dominates later cycles