Why We sleep Notes Mr. White

Circadian rhythm refers to

• the pattern of emotional ups and downs we routinely experience.

• a pattern of biological functioning that occurs on a roughly 24-hour cycle.

• the day and night pattern that most of us live on.

• the cycle of five distinct stages that we experience during a normal night's sleep.

Alpha waves are associated with

•  REM sleep. 
• NREM-1 sleep
•  NREM-2 sleep.
•  relaxed but awake state.

REM sleep is called paradoxical sleep because

• our heart rate is slow and steady, while our breathing is highly irregular.
• our heart rate is slow and steady, while our breathing is highly irregular.
• our nervous system is highly active, while our voluntary muscles hardly move.
• our brain and nervous system are less active and our muscles are very active.

The human sleep cycle repeats itself about every

• 30 minutes.
• 90 minutes.
•  2 1/2 hours. 
• 4 hours.

Which of the following is most accurate about a typical night's sleep?

• The sleep cycle repeats itself every 60 minutes.
• During REM sleep the muscles are tense and brain waves reveal deep relaxation
• As sleep progresses, NREM-3 sleep diminishes while REM sleep increases.
• Most of a night's sleep is spent in REM.

The large, slow brain waves associated with deep sleep are called

• alpha waves. 
• beta waves. 
• delta waves.
•  theta waves.

What fraction of our life is spent sleeping?

• 1/2
• 2/3
• 1/3
• 1/4

Babies spend most of their time dreaming.

• true
• false

The older we get the more sleep we need.

• true
• false

A belief in something that can't be seen or touched.

• chronobiology
• circadian idea
• construct
• chronology