Stages of sleep

Question 1

How do we define and measure sleep?

Answer 1

Sleep is defined by our brain’s electrical activity and measured using an electroencephalogram (EEG.)

Question 2

Define frequency

Answer 2

Waves per second

Question 3

What is amplitude?

Answer 3

The size of waves.

Question 4

What is stage 1 sleep? Also known as the beta stage.

Answer 4

Stage 1 sleep is defined by low amplitude and high-frequency waves. Often characterized by drowsiness and light sleep.

Question 5

What is stage 2 sleep? Also known as the alpha stage.

Answer 5

Stage 2 is characterized by sleep spindles (high frequencies of series waves) and K complexes (a biphasic wave stands out.)

Question 6

What is stage 3 sleep? Also known as the theta stage.

Answer 6

Slow waves and deep sleep. Delta waves (low frequency, high altitude.) Important to overall restfulness.

Question 7

After repeating stage 1 and 2, what happens during REM (rapid eye movement)?

Answer 7

Resembles stage 1. Muscles are relaxed but eyes are moving rapidly. Vivid dreams.

Question 8

What is stage 4,