Population-based studies estimate that ten to forty percent of American adults have intermittent insomnia and ten to fifteen percent have long-term sleep difficulties.(1) It is also estimated that ten to fifteen percent of the adult population suffers from chronic insomnia; an additional twenty to thirty-five percent has transient or occasional insomnia. ... They were awakened four hours after lights were out, dosed with sublingual Zolpidem (3.5 mg or 1.75 mg) or placebo, kept awake for thirty minutes, and then returned to bed for an additional four hours. ... In one of the studies done by not...

• Word Count: 2870
• Approx Pages: 11
• Has Bibliography
• Grade Level: Undergraduate

This period lasts approximately ten minutes until Stage II commences, lasting another fifteen minutes or so. ... It is important for the student to know that existing experiments have determined that physiological standards within the sleeping subject have "changed abruptly" (Murray 303) in the forty-five minutes that follow the onset of Stage IV. ...

• Word Count: 1429
• Approx Pages: 6
• Has Bibliography
• Grade Level: Undergraduate