Manifest Sleepiness Overview

Measurements of manifest sleepiness are actually designed to index the point at which alertness fails. An individual may be very sleepy but nonetheless can maintain wakefulness. However, at some point, even the most heroic attempts to stay awake are to no avail and it is at this point the individual lapses into sleep. There is usually some response slowing and lapsing even before frank sleep onset occurs. For many years the notion of "functional deafferentation" was considered; however, most data point toward inattention and slowing of information processing. Another controversial issue involves the concept of microsleep (brief sleep episodes lasting 5-15 seconds).

Industrial psychology and human factors research attempting to design better man-machine interfaces (ergonomics) avoided issues surrounding microsleep because an equipment operator's performance cannot be improved by rearranging a panel's switches, keyboards, and indicator lights if he or she has fallen asleep. Another issue concerning microsleep involves the locus of its generation. Attempts to externalize the cause of microsleep have led to blaming rural motor vehicle accidents on things such as "highway hypnosis." The problem, however, is internal. The driver is sleepy and when sleepiness reaches a threshold that exceeds the alertness system's ability to offset, manifest sleepiness occurs and sleep onset soon follows.

Hypnotism and Self Hypnosis v2

Hypnotism and Self Hypnosis v2

HYPNOTISM is by no means a new art. True, it has been developed into a science in comparatively recent years. But the principles of thought control have been used for thousands of years in India, ancient Egypt, among the Persians, Chinese and in many other ancient lands. Learn more within this guide.

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