Understanding the Stages of Sleep

How many stages of sleep are there?

• Five

• Six

• Four

• Three

What stages of sleep are considered non-REM?

• N2, N3, and REM

• N1, N2, and REM

• N1, N2, and N3

• N1, REM, and N3

What year was REM sleep discovered?

• 1950s

• 1960s

• 1970s

• 1940s

How long does one sleep cycle approximately take to complete?

• 120 minutes

• 90 minutes

• 75 minutes

• 60 minutes

What hormone does the pineal gland release during the N1 stage?

• Serotonin

• Cortisol

• Adrenaline

• Melatonin

What are sleep spindles?

• Muscle contractions

• Bursts of brain activity

• Rapid eye movements

• A type of dream

During which stage is it most difficult to wake someone up?

• N1

• N2

• N3

• REM

What is REM sleep characterized by?

• Slow heart rate

• Rapid and random eye movement

• Decreased brain activity

• Muscle tension

What percentage of sleep time do babies spend in REM sleep?

• Up to 25%

• Up to 60%

• Up to 35%

• Up to 50%

What can lead to fatigue and cognitive impairment due to sleep?

• Excessive REM sleep

• Failure to achieve REM sleep

• Too much N1 sleep

• Excessive sleep spindles