Where is the primary circadian biological clock located?

a)     grow longer b)     grow shorter c)     stay about the samed)    disappear totally

- List three ways that non-REM sleep differs from REM sleep.

- Narcolepsy is a broad neurological disorder of sleep that has several different types of symptoms. Name and describe one of the symptoms of narcolepsy.

- List three characteristics  of REM sleep (there are more!).