Sleep

Question 1

How many stages of sleep are there? How many are REM ?

Answer 1

Five ; 1-4 (NREM) , 5 (REM)

Question 2

Stage 1 Sleep

Answer 2

• NREM
• Light sleep / 5 mins
• Hallucinations like falling

Question 3

Stage 2 Sleep

Answer 3

• NREM
• 20 mins / Deeper sleep
• Bursts of rapid rhythmic brain activity ( K-complex )

Question 4

Stage 3 Sleep

Answer 4

• NREM
• Few minutes
• Slow delta waves

Question 5

Stage 4 Sleep

Answer 5

• 30 mins
• Slow delta waves
• Deep sleep / hard to wake
• Bed wetting , Sleep walking , Night terrors
• Will still respond to some stimuli ( like a baby )
• 4 REM gets shorter every sleep cycle

Question 6

What happens after NREM 4 ?

Answer 6

Body goes through stages 2 + 3 before REM.

Question 7

Stage 5 Sleep

Answer 7

Paradoxical Sleep

• REM
• 10 mins / Deep sleep = Difficult to wake up
• Dreams
• Body can’t move except eyes
• Heart rate increases / Rapid breathing + eye movement
• Gets longer over night

Question 8

Sleep Deprivation

Answer 8

Lack of sleep

1. Fatigue + Subsequent death
2. Impaired concentration
3. Emotional irritability
4. Depressed immune system
5. After 90 hours awake - Begin having perceptual distortion , hallucinations , and delusions.

Question 9

Why do we sleep?

Answer 9

1. Protects us - Sleeping in the darkness when predators loomed about kept our ancestors out of harm’s way.
2. Recuperates - Restores + Repairs brain tissue.
3. Helps memory - Restores + Rebuilds fading memories.
4. Sleep and Growth