51. While attending a lecture, Lea starts yawning and fights : 1411887
51. While attending a lecture, Lea starts yawning and fights hard to stay awake. She reclines in her chair and within minutes she falls asleep with her head jerking upward at short intervals. Lea is in:
A. stage 1 sleep.
B. stage 2 sleep.
C. stage 3 sleep.
D. stage 4 sleep.
52. As a part of a research, Natasha initially had difficulty falling asleep in the sleep lab, but finally drifted into sleep and was not awakened when a student researcher knocked a can of soda off the desk. The electroencephalograph (EEG) is displaying theta waves with occasional sleep spindles. The researchers feel confident that Natasha is:
A. about to wake up.
B. in stage 2 of the sleep cycle.
D. in REM sleep.
53. The stage when bedwetting (in children) and sleep talking occur is _____.
A. stage 1 sleep
B. delta sleep
C. stage 2 sleep
D. REM sleep
54. Brenda goes to check on her sleeping daughter and observes that the child’s eyes are moving up and down and from left to right under her eyelids. It is likely that she is:
A. in the deepest level of sleep.
C. in a hypnagogic state.
D. waking up.
55. Which of the following statements is true of REM sleep?
A. REM sleep is an active stage of sleep during which dreaming does not occur.
B. The longer the period of REM sleep, the more likely the person will report dreaming.
C. Non-REM sleep is characterized by intense rapid eye movement and vivid dreaming.
D. Reports of dreaming by individuals awakened from non-REM sleep are typically longer, more vivid, and less related to waking life than reports by those awakened from REM sleep.
56. Which of the following best characterizes a night of sleep?
A. A person falls into light sleep and then, ends in deep sleep.
B. A person passes from light sleep to dream sleep and ultimately to deep sleep.
C. A person’s depth of sleep alternates up and down several times.
D. A person’s sleep cycle skips REM sleep.
57. _____ refers to an active stage of sleep during which vivid dreaming occurs.
A. Spindle sleep
B. Delta sleep
C. REM sleep
D. Myoclonic sleep
58. REM sleep is initiated by a rise in _____, which activates the cerebral cortex while the rest of the brain remains relatively inactive.
59. REM sleep ends when there is a rise in _____, which increase the level of forebrain activity nearly to the awakened state.
A. melatonin and acetylcholine
B. serotonin and acetylcholine
C. norepinephrine and melatonin
D. serotonin and norepinephrine
60. The powerfully sleep-inducing chemicals produced by the body’s cells while a person is fighting an infection are known as _____.