Sleep has been the subject of speculation and thought since the
time of the early Greek philosophers, but only recently have researchers
discovered ways to study sleep in a systematic and objective way. The
advent of new technology such as the electroencephalograph has allowed
scientists to look at and measure electrical patterns and activity
produced by the sleeping brain.
While we can now investigate sleep and related phenomena, not all researchers agree on exactly why
we sleep. A number of different theories have been proposed to explain
the necessity of sleep as well as the functions and purposes of sleep.
The following are three of the major theories of sleep.
Repair and Restoration Theory of Sleep:
According to the repair and restoration theory of sleep, sleeping is
essential for revitalizing and restoring the physiological processes
that keep the body and mind healthy and properly functioning. This
theory suggests that NREM sleep is important for restoring physiological
functions, while REM sleep is essential in restoring mental functions.
Support
for this theory is provided by research that shows periods of REM sleep
increase following periods of sleep deprivation and strenuous physical
activity. During sleep, the body also increases its rate of cell
division and protein synthesis, further suggesting that repair and
restoration occurs during sleeping periods.
Evolutionary Theory of Sleep:
Evolutionary theory, also known as the adaptive theory of sleep,
suggests that periods of activity and inactivity evolved as a means of
conserving energy. According to this theory, all species have adapted to
sleep during periods of time when wakefulness would be the most
hazardous.
Support for this theory comes from comparative
research of different animal species. Animals that have few natural
predators, such as bears and lions, often sleep between 12 to 15 hours
each day. On the other hand, animals that have many natural predators
have only short periods of sleep, usually getting no more than 4 or 5
hours of sleep each day.
Information Consolidation Theory of Sleep:
The information consolidation
theory of sleep is based on cognitive research and suggests that people
sleep in order to process information that has been acquired during the
day. In addition to processing information from the day prior, this
theory also argues that sleep allows the brain to prepare for the day to
come. Some research also suggests that sleep helps cement the things we
have learned during the day into long-term memory.
Support for this idea stems from a number of sleep deprivation studies
demonstrating that a lack of sleep has a serious impact on the ability
to recall and remember information.
Final Thoughts:
While
there is research and evidence to support each of these theories of
sleep, there is still no clear-cut support for any one theory. It is
also possible that each of these theories can be used to explain why we
sleep. Sleeping impacts many physiological processes, so it is very
possible that sleep occurs for many reasons and purposes.
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