Science of Sleeping

The pattern of physical and behavioral changes that follows a 24 hour cycle, in accordance with the hours of light and darkness.

• REM

• NREM

• circadian rhythm

• ultradian rhythm

The stages of sleep are classified into two distinct basic types characterized by

• body temperature

• breathing rates.

• rapid eye movement vs non-rapid eye movement

• the ability of the sleeper to quickly respond to stimulus

The stages of sleep are differentiated from each other by

• varying levels of adrenaline found in the blood

• varying patterns of brain activity

• whether you are dreaming or not.

• your core body temperature

A hormone released by the pineal gland that increases feelings of relaxation and tiredness

• dopamine

• melatonin

• SCN

• serotonin

During this stage of sleep, you drift in and out of sleep and can be easily awakened.

• Stage 1

• Stage 2

• Stage 3

• Stage 4

During this stage of sleep, muscle activity and eye movements completely stop, and you become difficult to awaken.

• Stage 1

• REM

• Stage 2

• Stage 4

How many sleep stages do we go through 

• 2
• 3
• 4
• 5

What percentage of their life time does a person spend asleep?

• 1/3

• 1/9

• 1/10

• 1/100

As the sleep cycle evolves through the night, people tend to:

• spend more time in REM sleep and less time in NREM sleep.
• spend more time in NREM sleep and less time in REM sleep.
• spend a more or less equal amount of time in REM sleep and NREM sleep.
• spend more time in stage 4 sleep and less time in REM sleep.

If you were awakened during this sleep stage you might insist you were not asleep.

• NREM 1
• NREM 2
• NREM 3
• REM