Set 2: Stages of Sleep & Brain Waves

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32 Terms

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NREM
Non-Rapid Eye Movement sleep; includes stages NREM-1, NREM-2, and NREM-3.
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REM
Rapid Eye Movement sleep; a stage in which the brain is highly active and vivid dreams occur.
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How often do we cycle through sleep stages?
Approximately every 90 minutes.
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What is the order of the four sleep stages?
NREM-1 → NREM-2 → NREM-3 → REM.
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NREM-1
Light sleep in which a person is easily awakened; associated with alpha waves.
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What happens during NREM-1?
You begin falling asleep and may experience hallucinations and hypnagogic sensations.
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What are hallucinations?
False sensory experiences.
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Hypnagogic Sensations
Bizarre experiences while falling asleep, such as jerking or feeling like you are falling or floating.
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What brain waves are associated with NREM-1?
Alpha waves.
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NREM-2
You are fully asleep; associated with theta waves, sleep spindles, and K-complexes.
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What brain waves are associated with NREM-2?
Theta waves.
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Sleep Spindles
Random, short bursts of brain activity during NREM-2.
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K-Complexes
Random, tall bursts of brain activity during NREM-2.
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NREM-3
Deep sleep; associated with delta waves.
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What brain waves are associated with NREM-3?
Delta waves.
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REM Sleep
The body is relaxed as if paralyzed, but the brain is as active as if awake.
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What is paradoxical sleep?
REM sleep; the brain is active while the body remains relaxed and nearly paralyzed.
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What brain waves are associated with REM sleep according to the presentation?
Beta waves.
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What happens to REM sleep as the night progresses?
REM periods become longer and more frequent.
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During which sleep stage do the most vivid dreams occur?
REM sleep.
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Can dreams occur during stages other than REM?
Yes, but they are most vivid during REM sleep.
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REM Rebound
If deprived of REM sleep, a person spends more time in REM the next time they sleep.
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How does sleep change throughout a normal night?
NREM-3 shortens while NREM-2 and REM become longer.
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About how long after falling asleep does the first REM period begin according to the notes?
About one hour.
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Which stage is associated with feeling like you are falling or floating?
NREM-1.
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Which stage is associated with sleep spindles and being easily awakened?
NREM-2.
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Which stage is associated with slow, large delta waves?
NREM-3.
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Which stage is associated with rapid eye movements and vivid dreams?
REM.
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In which stage is the brain active but the body does not physically act out dreams?
REM.
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How can you recognize REM on an EEG worksheet?
Rapid, irregular, saw-toothed brain waves.
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How can you recognize NREM-3 on an EEG worksheet?
Large, slow delta waves.
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How can you recognize NREM-2 on an EEG worksheet?
Theta waves with sleep spindles and K-complexes.